From ec28e63c30962818dab315d64ee4da10005e47fd Mon Sep 17 00:00:00 2001
From: Simon Nagl <simonnagl@aim.com>
Date: Thu, 28 Apr 2016 22:41:15 +0200
Subject: [PATCH 1/1] Fix #282 use modern arithmetic expansion in shell

Use $((.*)) instead of $[.*]
The later one is old syntax
---
 charts.d/ap.chart.sh           | 12 +++----
 charts.d/apache.chart.sh       | 66 +++++++++++++++++-----------------
 charts.d/cpufreq.chart.sh      |  2 +-
 charts.d/example.chart.sh      | 18 +++++-----
 charts.d/load_average.chart.sh |  2 +-
 charts.d/mysql.chart.sh        | 42 +++++++++++-----------
 charts.d/nginx.chart.sh        | 22 ++++++------
 charts.d/nut.chart.sh          | 16 ++++-----
 charts.d/opensips.chart.sh     | 38 ++++++++++----------
 charts.d/phpfpm.chart.sh       | 18 +++++-----
 charts.d/postfix.chart.sh      |  4 +--
 charts.d/sensors.chart.sh      | 14 ++++----
 charts.d/squid.chart.sh        |  8 ++---
 charts.d/tomcat.chart.sh       | 18 +++++-----
 tests/stress.sh                | 28 +++++++--------
 15 files changed, 154 insertions(+), 154 deletions(-)

diff --git a/charts.d/ap.chart.sh b/charts.d/ap.chart.sh
index 10a65688..aed51c1b 100755
--- a/charts.d/ap.chart.sh
+++ b/charts.d/ap.chart.sh
@@ -54,25 +54,25 @@ ap_create() {
 
 		# create the chart with 3 dimensions
 		cat <<EOF
-CHART ap_clients.${dev} '' "Connected clients to ${ssid} on ${dev}" "clients" ${dev} ap.clients line $[ap_priority + 1] $ap_update_every
+CHART ap_clients.${dev} '' "Connected clients to ${ssid} on ${dev}" "clients" ${dev} ap.clients line $((ap_priority + 1)) $ap_update_every
 DIMENSION clients '' absolute 1 1
 
-CHART ap_bandwidth.${dev} '' "Bandwidth for ${ssid} on ${dev}" "kilobits/s" ${dev} ap.net area $[ap_priority + 2] $ap_update_every
+CHART ap_bandwidth.${dev} '' "Bandwidth for ${ssid} on ${dev}" "kilobits/s" ${dev} ap.net area $((ap_priority + 2)) $ap_update_every
 DIMENSION received '' incremental 8 1024
 DIMENSION sent '' incremental -8 1024
 
-CHART ap_packets.${dev} '' "Packets for ${ssid} on ${dev}" "packets/s" ${dev} ap.packets line $[ap_priority + 3] $ap_update_every
+CHART ap_packets.${dev} '' "Packets for ${ssid} on ${dev}" "packets/s" ${dev} ap.packets line $((ap_priority + 3)) $ap_update_every
 DIMENSION received '' incremental 1 1
 DIMENSION sent '' incremental -1 1
 
-CHART ap_issues.${dev} '' "Transmit Issues for ${ssid} on ${dev}" "issues/s" ${dev} ap.issues line $[ap_priority + 4] $ap_update_every
+CHART ap_issues.${dev} '' "Transmit Issues for ${ssid} on ${dev}" "issues/s" ${dev} ap.issues line $((ap_priority + 4)) $ap_update_every
 DIMENSION retries 'tx retries' incremental 1 1
 DIMENSION failures 'tx failures' incremental -1 1
 
-CHART ap_signal.${dev} '' "Average Signal for ${ssid} on ${dev}" "dBm" ${dev} ap.signal line $[ap_priority + 5] $ap_update_every
+CHART ap_signal.${dev} '' "Average Signal for ${ssid} on ${dev}" "dBm" ${dev} ap.signal line $((ap_priority + 5)) $ap_update_every
 DIMENSION signal 'average signal' absolute 1 1
 
-CHART ap_bitrate.${dev} '' "Bitrate for ${ssid} on ${dev}" "Mbps" ${dev} ap.bitrate line $[ap_priority + 6] $ap_update_every
+CHART ap_bitrate.${dev} '' "Bitrate for ${ssid} on ${dev}" "Mbps" ${dev} ap.bitrate line $((ap_priority + 6)) $ap_update_every
 DIMENSION receive '' absolute 1 1000
 DIMENSION transmit '' absolute -1 1000
 DIMENSION expected 'expected throughput' absolute 1 1000
diff --git a/charts.d/apache.chart.sh b/charts.d/apache.chart.sh
index c0fd3dc3..dbf14a43 100755
--- a/charts.d/apache.chart.sh
+++ b/charts.d/apache.chart.sh
@@ -47,21 +47,21 @@ apache_detect() {
 	for x in "${@}"
 	do
 		case "${x}" in
-			'Total Accesses') 		apache_key_accesses=$[i + 1] ;;
-			'Total kBytes') 		apache_key_kbytes=$[i + 1] ;;
-			'ReqPerSec') 			apache_key_reqpersec=$[i + 1] ;;
-			'BytesPerSec')			apache_key_bytespersec=$[i + 1] ;;
-			'BytesPerReq')			apache_key_bytesperreq=$[i + 1] ;;
-			'BusyWorkers')			apache_key_busyworkers=$[i + 1] ;;
-			'IdleWorkers')			apache_key_idleworkers=$[i + 1];;
-			'ConnsTotal')			apache_key_connstotal=$[i + 1] ;;
-			'ConnsAsyncWriting')	apache_key_connsasyncwriting=$[i + 1] ;;
-			'ConnsAsyncKeepAlive')	apache_key_connsasynckeepalive=$[i + 1] ;;
-			'ConnsAsyncClosing')	apache_key_connsasyncclosing=$[i + 1] ;;
-			'Scoreboard')			apache_key_scoreboard=$[i] ;;
+			'Total Accesses') 		apache_key_accesses=$((i + 1)) ;;
+			'Total kBytes') 		apache_key_kbytes=$((i + 1)) ;;
+			'ReqPerSec') 			apache_key_reqpersec=$((i + 1)) ;;
+			'BytesPerSec')			apache_key_bytespersec=$((i + 1)) ;;
+			'BytesPerReq')			apache_key_bytesperreq=$((i + 1)) ;;
+			'BusyWorkers')			apache_key_busyworkers=$((i + 1)) ;;
+			'IdleWorkers')			apache_key_idleworkers=$((i + 1));;
+			'ConnsTotal')			apache_key_connstotal=$((i + 1)) ;;
+			'ConnsAsyncWriting')	apache_key_connsasyncwriting=$((i + 1)) ;;
+			'ConnsAsyncKeepAlive')	apache_key_connsasynckeepalive=$((i + 1)) ;;
+			'ConnsAsyncClosing')	apache_key_connsasyncclosing=$((i + 1)) ;;
+			'Scoreboard')			apache_key_scoreboard=$((i)) ;;
 		esac
 
-		i=$[i + 1]
+		i=$((i + 1))
 	done
 
 	# we will not check of the Conns*
@@ -167,27 +167,27 @@ apache_check() {
 # _create is called once, to create the charts
 apache_create() {
 	cat <<EOF
-CHART apache.bytesperreq '' "apache Lifetime Avg. Response Size" "bytes/request" statistics apache.bytesperreq area $[apache_priority + 8] $apache_update_every
+CHART apache.bytesperreq '' "apache Lifetime Avg. Response Size" "bytes/request" statistics apache.bytesperreq area $((apache_priority + 8)) $apache_update_every
 DIMENSION size '' absolute 1 ${apache_decimal_detail}
-CHART apache.workers '' "apache Workers" "workers" workers apache.workers stacked $[apache_priority + 5] $apache_update_every
+CHART apache.workers '' "apache Workers" "workers" workers apache.workers stacked $((apache_priority + 5)) $apache_update_every
 DIMENSION idle '' absolute 1 1
 DIMENSION busy '' absolute 1 1
-CHART apache.reqpersec '' "apache Lifetime Avg. Requests/s" "requests/s" statistics apache.reqpersec line $[apache_priority + 6] $apache_update_every
+CHART apache.reqpersec '' "apache Lifetime Avg. Requests/s" "requests/s" statistics apache.reqpersec line $((apache_priority + 6)) $apache_update_every
 DIMENSION requests '' absolute 1 ${apache_decimal_detail}
-CHART apache.bytespersec '' "apache Lifetime Avg. Bandwidth/s" "kilobits/s" statistics apache.bytespersec area $[apache_priority + 7] $apache_update_every
-DIMENSION sent '' absolute 8 $[apache_decimal_detail * 1000]
-CHART apache.requests '' "apache Requests" "requests/s" requests apache.requests line $[apache_priority + 1] $apache_update_every
+CHART apache.bytespersec '' "apache Lifetime Avg. Bandwidth/s" "kilobits/s" statistics apache.bytespersec area $((apache_priority + 7)) $apache_update_every
+DIMENSION sent '' absolute 8 $((apache_decimal_detail * 1000))
+CHART apache.requests '' "apache Requests" "requests/s" requests apache.requests line $((apache_priority + 1)) $apache_update_every
 DIMENSION requests '' incremental 1 1
-CHART apache.net '' "apache Bandwidth" "kilobits/s" bandwidth apache.net area $[apache_priority + 3] $apache_update_every
+CHART apache.net '' "apache Bandwidth" "kilobits/s" bandwidth apache.net area $((apache_priority + 3)) $apache_update_every
 DIMENSION sent '' incremental 8 1
 EOF
 
 	if [ ${apache_has_conns} -eq 1 ]
 		then
 		cat <<EOF2
-CHART apache.connections '' "apache Connections" "connections" connections apache.connections line $[apache_priority + 2] $apache_update_every
+CHART apache.connections '' "apache Connections" "connections" connections apache.connections line $((apache_priority + 2)) $apache_update_every
 DIMENSION connections '' absolute 1 1
-CHART apache.conns_async '' "apache Async Connections" "connections" connections apache.conns_async stacked $[apache_priority + 4] $apache_update_every
+CHART apache.conns_async '' "apache Async Connections" "connections" connections apache.conns_async stacked $((apache_priority + 4)) $apache_update_every
 DIMENSION keepalive '' absolute 1 1
 DIMENSION closing '' absolute 1 1
 DIMENSION writing '' absolute 1 1
@@ -212,23 +212,23 @@ apache_update() {
 	# write the result of the work.
 	cat <<VALUESEOF
 BEGIN apache.requests $1
-SET requests = $[apache_accesses]
+SET requests = $((apache_accesses))
 END
 BEGIN apache.net $1
-SET sent = $[apache_kbytes]
+SET sent = $((apache_kbytes))
 END
 BEGIN apache.reqpersec $1
-SET requests = $[apache_reqpersec]
+SET requests = $((apache_reqpersec))
 END
 BEGIN apache.bytespersec $1
-SET sent = $[apache_bytespersec]
+SET sent = $((apache_bytespersec))
 END
 BEGIN apache.bytesperreq $1
-SET size = $[apache_bytesperreq]
+SET size = $((apache_bytesperreq))
 END
 BEGIN apache.workers $1
-SET idle = $[apache_idleworkers]
-SET busy = $[apache_busyworkers]
+SET idle = $((apache_idleworkers))
+SET busy = $((apache_busyworkers))
 END
 VALUESEOF
 
@@ -236,12 +236,12 @@ VALUESEOF
 		then
 	cat <<VALUESEOF2
 BEGIN apache.connections $1
-SET connections = $[apache_connstotal]
+SET connections = $((apache_connstotal))
 END
 BEGIN apache.conns_async $1
-SET keepalive = $[apache_connsasynckeepalive]
-SET closing = $[apache_connsasyncwriting]
-SET writing = $[apache_connsasyncwriting]
+SET keepalive = $((apache_connsasynckeepalive))
+SET closing = $((apache_connsasyncwriting))
+SET writing = $((apache_connsasyncwriting))
 END
 VALUESEOF2
 	fi
diff --git a/charts.d/cpufreq.chart.sh b/charts.d/cpufreq.chart.sh
index 6a968237..008ffe1d 100755
--- a/charts.d/cpufreq.chart.sh
+++ b/charts.d/cpufreq.chart.sh
@@ -36,7 +36,7 @@ cpufreq_create() {
 	# - the highest speed we can achieve -
 	[ $cpufreq_source_update -eq 1 ] && echo >$TMP_DIR/cpufreq.sh "cpufreq_update() {"
 
-	echo "CHART cpu.cpufreq '' 'CPU Clock' 'MHz' 'cpufreq' '' line $[cpufreq_priority + 1] $cpufreq_update_every"
+	echo "CHART cpu.cpufreq '' 'CPU Clock' 'MHz' 'cpufreq' '' line $((cpufreq_priority + 1)) $cpufreq_update_every"
 	echo >>$TMP_DIR/cpufreq.sh "echo \"BEGIN cpu.cpufreq \$1\""
 
 	i=0
diff --git a/charts.d/example.chart.sh b/charts.d/example.chart.sh
index 34a3bc1b..ad205046 100755
--- a/charts.d/example.chart.sh
+++ b/charts.d/example.chart.sh
@@ -22,11 +22,11 @@ example_check() {
 example_create() {
 	# create the chart with 3 dimensions
 	cat <<EOF
-CHART example.random '' "Random Numbers Stacked Chart" "% of random numbers" random random stacked $[example_priority] $example_update_every
+CHART example.random '' "Random Numbers Stacked Chart" "% of random numbers" random random stacked $((example_priority)) $example_update_every
 DIMENSION random1 '' percentage-of-absolute-row 1 1
 DIMENSION random2 '' percentage-of-absolute-row 1 1
 DIMENSION random3 '' percentage-of-absolute-row 1 1
-CHART example.random2 '' "A random number" "random number" random random area $[example_priority + 1] $example_update_every
+CHART example.random2 '' "A random number" "random number" random random area $((example_priority + 1)) $example_update_every
 DIMENSION random '' absolute 1 1
 EOF
 
@@ -49,19 +49,19 @@ example_update() {
 	value1=$RANDOM
 	value2=$RANDOM
 	value3=$RANDOM
-	value4=$[8192 + (RANDOM * 16383 / 32767) ]
+	value4=$((8192 + (RANDOM * 16383 / 32767) ))
 
 	if [ $example_count -gt 0 ]
 		then
-		example_count=$[example_count - 1]
+		example_count=$((example_count - 1))
 
-		[ $example_last -gt 16383 ] && value4=$[example_last + (RANDOM * ( (32767 - example_last) / 2) / 32767)]
-		[ $example_last -le 16383 ] && value4=$[example_last - (RANDOM * (example_last / 2) / 32767)]
+		[ $example_last -gt 16383 ] && value4=$((example_last + (RANDOM * ( (32767 - example_last) / 2) / 32767)))
+		[ $example_last -le 16383 ] && value4=$((example_last - (RANDOM * (example_last / 2) / 32767)))
 	else
-		example_count=$[1 + (RANDOM * 5 / 32767) ]
+		example_count=$((1 + (RANDOM * 5 / 32767) ))
 
-		[ $example_last -gt 16383 -a $value4 -gt 16383 ] && value4=$[value4 - 16383]
-		[ $example_last -le 16383 -a $value4 -lt 16383 ] && value4=$[value4 + 16383]
+		[ $example_last -gt 16383 -a $value4 -gt 16383 ] && value4=$((value4 - 16383))
+		[ $example_last -le 16383 -a $value4 -lt 16383 ] && value4=$((value4 + 16383))
 	fi
 	example_last=$value4
 
diff --git a/charts.d/load_average.chart.sh b/charts.d/load_average.chart.sh
index 257ea7ca..4d86a8f4 100755
--- a/charts.d/load_average.chart.sh
+++ b/charts.d/load_average.chart.sh
@@ -28,7 +28,7 @@ load_average_check() {
 load_average_create() {
 	# create a chart with 3 dimensions
 cat <<EOF
-CHART system.load '' "System Load Average" "load" load system.load line $[load_priority + 1] $load_average_update_every
+CHART system.load '' "System Load Average" "load" load system.load line $((load_priority + 1)) $load_average_update_every
 DIMENSION load1 '1 min' absolute 1 100
 DIMENSION load5 '5 mins' absolute 1 100
 DIMENSION load15 '15 mins' absolute 1 100
diff --git a/charts.d/mysql.chart.sh b/charts.d/mysql.chart.sh
index e89ffad5..1a313410 100755
--- a/charts.d/mysql.chart.sh
+++ b/charts.d/mysql.chart.sh
@@ -187,16 +187,16 @@ mysql_create() {
 	for x in "${mysql_ids[@]}"
 	do
 		cat <<EOF
-CHART mysql_$x.net '' "mysql Bandwidth" "kilobits/s" bandwidth mysql.net area $[mysql_priority + 1] $mysql_update_every
+CHART mysql_$x.net '' "mysql Bandwidth" "kilobits/s" bandwidth mysql.net area $((mysql_priority + 1)) $mysql_update_every
 DIMENSION Bytes_received in incremental 8 1024
 DIMENSION Bytes_sent out incremental -8 1024
 
-CHART mysql_$x.queries '' "mysql Queries" "queries/s" queries mysql.queries line $[mysql_priority + 2] $mysql_update_every
+CHART mysql_$x.queries '' "mysql Queries" "queries/s" queries mysql.queries line $((mysql_priority + 2)) $mysql_update_every
 DIMENSION Queries queries incremental 1 1
 DIMENSION Questions questions incremental 1 1
 DIMENSION Slow_queries slow_queries incremental -1 1
 
-CHART mysql_$x.handlers '' "mysql Handlers" "handlers/s" handlers mysql.handlers line $[mysql_priority + 3] $mysql_update_every
+CHART mysql_$x.handlers '' "mysql Handlers" "handlers/s" handlers mysql.handlers line $((mysql_priority + 3)) $mysql_update_every
 DIMENSION Handler_commit commit incremental 1 1
 DIMENSION Handler_delete delete incremental 1 1
 DIMENSION Handler_prepare prepare incremental 1 1
@@ -212,75 +212,75 @@ DIMENSION Handler_savepoint_rollback savepoint_rollback incremental 1 1
 DIMENSION Handler_update update incremental 1 1
 DIMENSION Handler_write write incremental 1 1
 
-CHART mysql_$x.table_locks '' "mysql Tables Locks" "locks/s" locks mysql.table_locks line $[mysql_priority + 4] $mysql_update_every
+CHART mysql_$x.table_locks '' "mysql Tables Locks" "locks/s" locks mysql.table_locks line $((mysql_priority + 4)) $mysql_update_every
 DIMENSION Table_locks_immediate immediate incremental 1 1
 DIMENSION Table_locks_waited waited incremental -1 1
 
-CHART mysql_$x.join_issues '' "mysql Select Join Issues" "joins/s" issues mysql.join_issues line $[mysql_priority + 5] $mysql_update_every
+CHART mysql_$x.join_issues '' "mysql Select Join Issues" "joins/s" issues mysql.join_issues line $((mysql_priority + 5)) $mysql_update_every
 DIMENSION Select_full_join full_join incremental 1 1
 DIMENSION Select_full_range_join full_range_join incremental 1 1
 DIMENSION Select_range range incremental 1 1
 DIMENSION Select_range_check range_check incremental 1 1
 DIMENSION Select_scan scan incremental 1 1
 
-CHART mysql_$x.sort_issues '' "mysql Sort Issues" "issues/s" issues mysql.sort.issues line $[mysql_priority + 6] $mysql_update_every
+CHART mysql_$x.sort_issues '' "mysql Sort Issues" "issues/s" issues mysql.sort.issues line $((mysql_priority + 6)) $mysql_update_every
 DIMENSION Sort_merge_passes merge_passes incremental 1 1
 DIMENSION Sort_range range incremental 1 1
 DIMENSION Sort_scan scan incremental 1 1
 
-CHART mysql_$x.tmp '' "mysql Tmp Operations" "counter" temporaries mysql.tmp line $[mysql_priority + 7] $mysql_update_every
+CHART mysql_$x.tmp '' "mysql Tmp Operations" "counter" temporaries mysql.tmp line $((mysql_priority + 7)) $mysql_update_every
 DIMENSION Created_tmp_disk_tables disk_tables incremental 1 1
 DIMENSION Created_tmp_files files incremental 1 1
 DIMENSION Created_tmp_tables tables incremental 1 1
 
-CHART mysql_$x.connections '' "mysql Connections" "connections/s" connections mysql.connections line $[mysql_priority + 8] $mysql_update_every
+CHART mysql_$x.connections '' "mysql Connections" "connections/s" connections mysql.connections line $((mysql_priority + 8)) $mysql_update_every
 DIMENSION Connections all incremental 1 1
 DIMENSION Aborted_connects aborded incremental 1 1
 
-CHART mysql_$x.binlog_cache '' "mysql Binlog Cache" "transactions/s" binlog mysql.binlog_cache line $[mysql_priority + 9] $mysql_update_every
+CHART mysql_$x.binlog_cache '' "mysql Binlog Cache" "transactions/s" binlog mysql.binlog_cache line $((mysql_priority + 9)) $mysql_update_every
 DIMENSION Binlog_cache_disk_use disk incremental 1 1
 DIMENSION Binlog_cache_use all incremental 1 1
 
-CHART mysql_$x.threads '' "mysql Threads" "threads" threads mysql.threads line $[mysql_priority + 10] $mysql_update_every
+CHART mysql_$x.threads '' "mysql Threads" "threads" threads mysql.threads line $((mysql_priority + 10)) $mysql_update_every
 DIMENSION Threads_connected connected absolute 1 1
 DIMENSION Threads_created created incremental 1 1
 DIMENSION Threads_cached cached absolute -1 1
 DIMENSION Threads_running running absolute 1 1
 
-CHART mysql_$x.thread_cache_misses '' "mysql Threads Cache Misses" "misses" threads mysql.thread_cache_misses area $[mysql_priority + 11] $mysql_update_every
+CHART mysql_$x.thread_cache_misses '' "mysql Threads Cache Misses" "misses" threads mysql.thread_cache_misses area $((mysql_priority + 11)) $mysql_update_every
 DIMENSION misses misses absolute 1 100
 
-CHART mysql_$x.innodb_io '' "mysql InnoDB I/O Bandwidth" "kilobytes/s" innodb mysql.innodb_io area $[mysql_priority + 12] $mysql_update_every
+CHART mysql_$x.innodb_io '' "mysql InnoDB I/O Bandwidth" "kilobytes/s" innodb mysql.innodb_io area $((mysql_priority + 12)) $mysql_update_every
 DIMENSION Innodb_data_read read incremental 1 1024
 DIMENSION Innodb_data_written write incremental -1 1024
 
-CHART mysql_$x.innodb_io_ops '' "mysql InnoDB I/O Operations" "operations/s" innodb mysql.innodb_io_ops line $[mysql_priority + 13] $mysql_update_every
+CHART mysql_$x.innodb_io_ops '' "mysql InnoDB I/O Operations" "operations/s" innodb mysql.innodb_io_ops line $((mysql_priority + 13)) $mysql_update_every
 DIMENSION Innodb_data_reads reads incremental 1 1
 DIMENSION Innodb_data_writes writes incremental -1 1
 DIMENSION Innodb_data_fsyncs fsyncs incremental 1 1
 
-CHART mysql_$x.innodb_io_pending_ops '' "mysql InnoDB Pending I/O Operations" "operations" innodb mysql.innodb_io_pending_ops line $[mysql_priority + 14] $mysql_update_every
+CHART mysql_$x.innodb_io_pending_ops '' "mysql InnoDB Pending I/O Operations" "operations" innodb mysql.innodb_io_pending_ops line $((mysql_priority + 14)) $mysql_update_every
 DIMENSION Innodb_data_pending_reads reads absolute 1 1
 DIMENSION Innodb_data_pending_writes writes absolute -1 1
 DIMENSION Innodb_data_pending_fsyncs fsyncs absolute 1 1
 
-CHART mysql_$x.innodb_log '' "mysql InnoDB Log Operations" "operations/s" innodb mysql.innodb_log line $[mysql_priority + 15] $mysql_update_every
+CHART mysql_$x.innodb_log '' "mysql InnoDB Log Operations" "operations/s" innodb mysql.innodb_log line $((mysql_priority + 15)) $mysql_update_every
 DIMENSION Innodb_log_waits waits incremental 1 1
 DIMENSION Innodb_log_write_requests write_requests incremental -1 1
 DIMENSION Innodb_log_writes writes incremental -1 1
 
-CHART mysql_$x.innodb_os_log '' "mysql InnoDB OS Log Operations" "operations" innodb mysql.innodb_os_log line $[mysql_priority + 16] $mysql_update_every
+CHART mysql_$x.innodb_os_log '' "mysql InnoDB OS Log Operations" "operations" innodb mysql.innodb_os_log line $((mysql_priority + 16)) $mysql_update_every
 DIMENSION Innodb_os_log_fsyncs fsyncs incremental 1 1
 DIMENSION Innodb_os_log_pending_fsyncs pending_fsyncs absolute 1 1
 DIMENSION Innodb_os_log_pending_writes pending_writes absolute -1 1
 
-CHART mysql_$x.innodb_os_log_io '' "mysql InnoDB OS Log Bandwidth" "kilobytes/s" innodb mysql.innodb_os_log_io area $[mysql_priority + 17] $mysql_update_every
+CHART mysql_$x.innodb_os_log_io '' "mysql InnoDB OS Log Bandwidth" "kilobytes/s" innodb mysql.innodb_os_log_io area $((mysql_priority + 17)) $mysql_update_every
 DIMENSION Innodb_os_log_written write incremental -1 1024
 
-CHART mysql_$x.innodb_cur_row_lock '' "mysql InnoDB Current Row Locks" "operations" innodb mysql.innodb_cur_row_lock area $[mysql_priority + 18] $mysql_update_every
+CHART mysql_$x.innodb_cur_row_lock '' "mysql InnoDB Current Row Locks" "operations" innodb mysql.innodb_cur_row_lock area $((mysql_priority + 18)) $mysql_update_every
 DIMENSION Innodb_row_lock_current_waits current_waits absolute 1 1
 
-CHART mysql_$x.innodb_rows '' "mysql InnoDB Row Operations" "operations/s" innodb mysql.innodb_rows area $[mysql_priority + 19] $mysql_update_every
+CHART mysql_$x.innodb_rows '' "mysql InnoDB Row Operations" "operations/s" innodb mysql.innodb_rows area $((mysql_priority + 19)) $mysql_update_every
 DIMENSION Innodb_rows_read read incremental 1 1
 DIMENSION Innodb_rows_deleted deleted incremental -1 1
 DIMENSION Innodb_rows_inserted inserted incremental 1 1
@@ -291,7 +291,7 @@ EOF
 	if [ ! -z "$mysql_Binlog_stmt_cache_disk_use" ]
 		then
 		cat <<EOF
-CHART mysql_$x.binlog_stmt_cache '' "mysql Binlog Statement Cache" "statements/s" binlog mysql.binlog_stmt_cache line $[mysql_priority + 20] $mysql_update_every
+CHART mysql_$x.binlog_stmt_cache '' "mysql Binlog Statement Cache" "statements/s" binlog mysql.binlog_stmt_cache line $((mysql_priority + 20)) $mysql_update_every
 DIMENSION Binlog_stmt_cache_disk_use disk incremental 1 1
 DIMENSION Binlog_stmt_cache_use all incremental 1 1
 EOF
@@ -300,7 +300,7 @@ EOF
 	if [ ! -z "$mysql_Connection_errors_accept" ]
 		then
 		cat <<EOF
-CHART mysql_$x.connection_errors '' "mysql Connection Errors" "connections/s" connections mysql.connection_errors line $[mysql_priority + 21] $mysql_update_every
+CHART mysql_$x.connection_errors '' "mysql Connection Errors" "connections/s" connections mysql.connection_errors line $((mysql_priority + 21)) $mysql_update_every
 DIMENSION Connection_errors_accept accept incremental 1 1
 DIMENSION Connection_errors_internal internal incremental 1 1
 DIMENSION Connection_errors_max_connections max incremental 1 1
diff --git a/charts.d/nginx.chart.sh b/charts.d/nginx.chart.sh
index 91f269be..450aa94b 100755
--- a/charts.d/nginx.chart.sh
+++ b/charts.d/nginx.chart.sh
@@ -81,18 +81,18 @@ nginx_check() {
 # _create is called once, to create the charts
 nginx_create() {
 	cat <<EOF
-CHART nginx.connections '' "nginx Active Connections" "connections" nginx nginx.connections line $[nginx_priority + 1] $nginx_update_every
+CHART nginx.connections '' "nginx Active Connections" "connections" nginx nginx.connections line $((nginx_priority + 1)) $nginx_update_every
 DIMENSION active '' absolute 1 1
 
-CHART nginx.requests '' "nginx Requests" "requests/s" nginx nginx.requests line $[nginx_priority + 2] $nginx_update_every
+CHART nginx.requests '' "nginx Requests" "requests/s" nginx nginx.requests line $((nginx_priority + 2)) $nginx_update_every
 DIMENSION requests '' incremental 1 1
 
-CHART nginx.connections_status '' "nginx Active Connections by Status" "connections" nginx nginx.connections.status line $[nginx_priority + 3] $nginx_update_every
+CHART nginx.connections_status '' "nginx Active Connections by Status" "connections" nginx nginx.connections.status line $((nginx_priority + 3)) $nginx_update_every
 DIMENSION reading '' absolute 1 1
 DIMENSION writing '' absolute 1 1
 DIMENSION waiting idle absolute 1 1
 
-CHART nginx.connect_rate '' "nginx Connections Rate" "connections/s" nginx nginx.connections.rate line $[nginx_priority + 4] $nginx_update_every
+CHART nginx.connect_rate '' "nginx Connections Rate" "connections/s" nginx nginx.connections.rate line $((nginx_priority + 4)) $nginx_update_every
 DIMENSION accepts accepted incremental 1 1
 DIMENSION handled '' incremental 1 1
 EOF
@@ -114,19 +114,19 @@ nginx_update() {
 	# write the result of the work.
 	cat <<VALUESEOF
 BEGIN nginx.connections $1
-SET active = $[nginx_active_connections]
+SET active = $((nginx_active_connections))
 END
 BEGIN nginx.requests $1
-SET requests = $[nginx_requests]
+SET requests = $((nginx_requests))
 END
 BEGIN nginx.connections_status $1
-SET reading = $[nginx_reading]
-SET writing = $[nginx_writing]
-SET waiting = $[nginx_waiting]
+SET reading = $((nginx_reading))
+SET writing = $((nginx_writing))
+SET waiting = $((nginx_waiting))
 END
 BEGIN nginx.connect_rate $1
-SET accepts = $[nginx_accepts]
-SET handled = $[nginx_handled]
+SET accepts = $((nginx_accepts))
+SET handled = $((nginx_handled))
 END
 VALUESEOF
 
diff --git a/charts.d/nut.chart.sh b/charts.d/nut.chart.sh
index 343c6d9c..a4720845 100755
--- a/charts.d/nut.chart.sh
+++ b/charts.d/nut.chart.sh
@@ -61,34 +61,34 @@ nut_create() {
 	for x in "${nut_ids[@]}"
 	do
 		cat <<EOF
-CHART nut_$x.charge '' "UPS Charge" "percentage" ups nut.charge area $[nut_priority + 1] $nut_update_every
+CHART nut_$x.charge '' "UPS Charge" "percentage" ups nut.charge area $((nut_priority + 1)) $nut_update_every
 DIMENSION battery_charge charge absolute 1 100
 
-CHART nut_$x.battery_voltage '' "UPS Battery Voltage" "Volts" ups nut.battery.voltage line $[nut_priority + 2] $nut_update_every
+CHART nut_$x.battery_voltage '' "UPS Battery Voltage" "Volts" ups nut.battery.voltage line $((nut_priority + 2)) $nut_update_every
 DIMENSION battery_voltage voltage absolute 1 100
 DIMENSION battery_voltage_high high absolute 1 100
 DIMENSION battery_voltage_low low absolute 1 100
 DIMENSION battery_voltage_nominal nominal absolute 1 100
 
-CHART nut_$x.input_voltage '' "UPS Input Voltage" "Volts" input nut.input.voltage line $[nut_priority + 3] $nut_update_every
+CHART nut_$x.input_voltage '' "UPS Input Voltage" "Volts" input nut.input.voltage line $((nut_priority + 3)) $nut_update_every
 DIMENSION input_voltage voltage absolute 1 100
 DIMENSION input_voltage_fault fault absolute 1 100
 DIMENSION input_voltage_nominal nominal absolute 1 100
 
-CHART nut_$x.input_current '' "UPS Input Current" "Ampere" input nut.input.current line $[nut_priority + 4] $nut_update_every
+CHART nut_$x.input_current '' "UPS Input Current" "Ampere" input nut.input.current line $((nut_priority + 4)) $nut_update_every
 DIMENSION input_current_nominal nominal absolute 1 100
 
-CHART nut_$x.input_frequency '' "UPS Input Frequency" "Hz" input nut.input.frequency line $[nut_priority + 5] $nut_update_every
+CHART nut_$x.input_frequency '' "UPS Input Frequency" "Hz" input nut.input.frequency line $((nut_priority + 5)) $nut_update_every
 DIMENSION input_frequency frequency absolute 1 100
 DIMENSION input_frequency_nominal nominal absolute 1 100
 
-CHART nut_$x.output_voltage '' "UPS Output Voltage" "Volts" output nut.output.voltage line $[nut_priority + 6] $nut_update_every
+CHART nut_$x.output_voltage '' "UPS Output Voltage" "Volts" output nut.output.voltage line $((nut_priority + 6)) $nut_update_every
 DIMENSION output_voltage voltage absolute 1 100
 
-CHART nut_$x.load '' "UPS Load" "percentage" ups nut.load area $[nut_priority] $nut_update_every
+CHART nut_$x.load '' "UPS Load" "percentage" ups nut.load area $((nut_priority)) $nut_update_every
 DIMENSION load load absolute 1 100
 
-CHART nut_$x.temp '' "UPS Temperature" "temperature" ups nut.temperature line $[nut_priority + 7] $nut_update_every
+CHART nut_$x.temp '' "UPS Temperature" "temperature" ups nut.temperature line $((nut_priority + 7)) $nut_update_every
 DIMENSION temp temp absolute 1 100
 EOF
 	done
diff --git a/charts.d/opensips.chart.sh b/charts.d/opensips.chart.sh
index 4b60c811..c7066ec0 100755
--- a/charts.d/opensips.chart.sh
+++ b/charts.d/opensips.chart.sh
@@ -45,61 +45,61 @@ opensips_check() {
 opensips_create() {
 	# create the charts
 	cat <<EOF
-CHART opensips.dialogs_active '' "OpenSIPS Active Dialogs" "dialogs" dialogs '' area $[opensips_priority + 1] $opensips_update_every
+CHART opensips.dialogs_active '' "OpenSIPS Active Dialogs" "dialogs" dialogs '' area $((opensips_priority + 1)) $opensips_update_every
 DIMENSION dialog_active_dialogs active absolute 1 1
 DIMENSION dialog_early_dialogs early absolute -1 1
 
-CHART opensips.users '' "OpenSIPS Users" "users" users '' line $[opensips_priority + 2] $opensips_update_every
+CHART opensips.users '' "OpenSIPS Users" "users" users '' line $((opensips_priority + 2)) $opensips_update_every
 DIMENSION usrloc_registered_users registered absolute 1 1
 DIMENSION usrloc_location_users location absolute 1 1
 DIMENSION usrloc_location_contacts contacts absolute 1 1
 DIMENSION usrloc_location_expires expires incremental -1 1
 
-CHART opensips.registrar '' "OpenSIPS Registrar" "registrations/s" registrar '' line $[opensips_priority + 3] $opensips_update_every
+CHART opensips.registrar '' "OpenSIPS Registrar" "registrations/s" registrar '' line $((opensips_priority + 3)) $opensips_update_every
 DIMENSION registrar_accepted_regs accepted incremental 1 1
 DIMENSION registrar_rejected_regs rejected incremental -1 1
 
-CHART opensips.transactions '' "OpenSIPS Transactions" "transactions/s" transactions '' line $[opensips_priority + 4] $opensips_update_every
+CHART opensips.transactions '' "OpenSIPS Transactions" "transactions/s" transactions '' line $((opensips_priority + 4)) $opensips_update_every
 DIMENSION tm_UAS_transactions UAS incremental 1 1
 DIMENSION tm_UAC_transactions UAC incremental -1 1
 
-CHART opensips.core_rcv '' "OpenSIPS Core Receives" "queries/s" core '' line $[opensips_priority + 5] $opensips_update_every
+CHART opensips.core_rcv '' "OpenSIPS Core Receives" "queries/s" core '' line $((opensips_priority + 5)) $opensips_update_every
 DIMENSION core_rcv_requests requests incremental 1 1
 DIMENSION core_rcv_replies replies incremental -1 1
 
-CHART opensips.core_fwd '' "OpenSIPS Core Forwards" "queries/s" core '' line $[opensips_priority + 6] $opensips_update_every
+CHART opensips.core_fwd '' "OpenSIPS Core Forwards" "queries/s" core '' line $((opensips_priority + 6)) $opensips_update_every
 DIMENSION core_fwd_requests requests incremental 1 1
 DIMENSION core_fwd_replies replies incremental -1 1
 
-CHART opensips.core_drop '' "OpenSIPS Core Drops" "queries/s" core '' line $[opensips_priority + 7] $opensips_update_every
+CHART opensips.core_drop '' "OpenSIPS Core Drops" "queries/s" core '' line $((opensips_priority + 7)) $opensips_update_every
 DIMENSION core_drop_requests requests incremental 1 1
 DIMENSION core_drop_replies replies incremental -1 1
 
-CHART opensips.core_err '' "OpenSIPS Core Errors" "queries/s" core '' line $[opensips_priority + 8] $opensips_update_every
+CHART opensips.core_err '' "OpenSIPS Core Errors" "queries/s" core '' line $((opensips_priority + 8)) $opensips_update_every
 DIMENSION core_err_requests requests incremental 1 1
 DIMENSION core_err_replies replies incremental -1 1
 
-CHART opensips.core_bad '' "OpenSIPS Core Bad" "queries/s" core '' line $[opensips_priority + 9] $opensips_update_every
+CHART opensips.core_bad '' "OpenSIPS Core Bad" "queries/s" core '' line $((opensips_priority + 9)) $opensips_update_every
 DIMENSION core_bad_URIs_rcvd bad_URIs_rcvd incremental 1 1
 DIMENSION core_unsupported_methods unsupported_methods incremental 1 1
 DIMENSION core_bad_msg_hdr bad_msg_hdr incremental 1 1
 
-CHART opensips.tm_replies '' "OpenSIPS TM Replies" "replies/s" transactions '' line $[opensips_priority + 10] $opensips_update_every
+CHART opensips.tm_replies '' "OpenSIPS TM Replies" "replies/s" transactions '' line $((opensips_priority + 10)) $opensips_update_every
 DIMENSION tm_received_replies received incremental 1 1
 DIMENSION tm_relayed_replies relayed incremental 1 1
 DIMENSION tm_local_replies local incremental 1 1
 
-CHART opensips.transactions_status '' "OpenSIPS Transactions Status" "transactions/s" transactions '' line $[opensips_priority + 11] $opensips_update_every
+CHART opensips.transactions_status '' "OpenSIPS Transactions Status" "transactions/s" transactions '' line $((opensips_priority + 11)) $opensips_update_every
 DIMENSION tm_2xx_transactions 2xx incremental 1 1
 DIMENSION tm_3xx_transactions 3xx incremental 1 1
 DIMENSION tm_4xx_transactions 4xx incremental 1 1
 DIMENSION tm_5xx_transactions 5xx incremental 1 1
 DIMENSION tm_6xx_transactions 6xx incremental 1 1
 
-CHART opensips.transactions_inuse '' "OpenSIPS InUse Transactions" "transactions" transactions '' line $[opensips_priority + 12] $opensips_update_every
+CHART opensips.transactions_inuse '' "OpenSIPS InUse Transactions" "transactions" transactions '' line $((opensips_priority + 12)) $opensips_update_every
 DIMENSION tm_inuse_transactions inuse absolute 1 1
 
-CHART opensips.sl_replies '' "OpenSIPS SL Replies" "replies/s" core '' line $[opensips_priority + 13] $opensips_update_every
+CHART opensips.sl_replies '' "OpenSIPS SL Replies" "replies/s" core '' line $((opensips_priority + 13)) $opensips_update_every
 DIMENSION sl_1xx_replies 1xx incremental 1 1
 DIMENSION sl_2xx_replies 2xx incremental 1 1
 DIMENSION sl_3xx_replies 3xx incremental 1 1
@@ -110,31 +110,31 @@ DIMENSION sl_sent_replies sent incremental 1 1
 DIMENSION sl_sent_err_replies error incremental 1 1
 DIMENSION sl_received_ACKs ACKed incremental 1 1
 
-CHART opensips.dialogs '' "OpenSIPS Dialogs" "dialogs/s" dialogs '' line $[opensips_priority + 14] $opensips_update_every
+CHART opensips.dialogs '' "OpenSIPS Dialogs" "dialogs/s" dialogs '' line $((opensips_priority + 14)) $opensips_update_every
 DIMENSION dialog_processed_dialogs processed incremental 1 1
 DIMENSION dialog_expired_dialogs expired incremental 1 1
 DIMENSION dialog_failed_dialogs failed incremental -1 1
 
-CHART opensips.net_waiting '' "OpenSIPS Network Waiting" "kilobytes" net '' line $[opensips_priority + 15] $opensips_update_every
+CHART opensips.net_waiting '' "OpenSIPS Network Waiting" "kilobytes" net '' line $((opensips_priority + 15)) $opensips_update_every
 DIMENSION net_waiting_udp UDP absolute 1 1024
 DIMENSION net_waiting_tcp TCP absolute 1 1024
 
-CHART opensips.uri_checks '' "OpenSIPS URI Checks" "checks / sec" uri '' line $[opensips_priority + 16] $opensips_update_every
+CHART opensips.uri_checks '' "OpenSIPS URI Checks" "checks / sec" uri '' line $((opensips_priority + 16)) $opensips_update_every
 DIMENSION uri_positive_checks positive incremental 1 1
 DIMENSION uri_negative_checks negative incremental -1 1
 
-CHART opensips.traces '' "OpenSIPS Traces" "traces / sec" traces '' line $[opensips_priority + 17] $opensips_update_every
+CHART opensips.traces '' "OpenSIPS Traces" "traces / sec" traces '' line $((opensips_priority + 17)) $opensips_update_every
 DIMENSION siptrace_traced_requests requests incremental 1 1
 DIMENSION siptrace_traced_replies replies incremental -1 1
 
-CHART opensips.shmem '' "OpenSIPS Shared Memory" "kilobytes" mem '' line $[opensips_priority + 18] $opensips_update_every
+CHART opensips.shmem '' "OpenSIPS Shared Memory" "kilobytes" mem '' line $((opensips_priority + 18)) $opensips_update_every
 DIMENSION shmem_total_size total absolute 1 1024
 DIMENSION shmem_used_size used absolute 1 1024
 DIMENSION shmem_real_used_size real_used absolute 1 1024
 DIMENSION shmem_max_used_size max_used absolute 1 1024
 DIMENSION shmem_free_size free absolute 1 1024
 
-CHART opensips.shmem_fragments '' "OpenSIPS Shared Memory Fragmentation" "fragments" mem '' line $[opensips_priority + 19] $opensips_update_every
+CHART opensips.shmem_fragments '' "OpenSIPS Shared Memory Fragmentation" "fragments" mem '' line $((opensips_priority + 19)) $opensips_update_every
 DIMENSION shmem_fragments fragments absolute 1 1
 EOF
 
diff --git a/charts.d/phpfpm.chart.sh b/charts.d/phpfpm.chart.sh
index 60e6b2c1..c0532fab 100755
--- a/charts.d/phpfpm.chart.sh
+++ b/charts.d/phpfpm.chart.sh
@@ -120,15 +120,15 @@ phpfpm_create() {
 	for m in "${!phpfpm_urls[@]}"
 	do
 		cat <<EOF
-CHART phpfpm_$m.connections '' "PHP-FPM Active Connections" "connections" phpfpm phpfpm.connections line $[phpfpm_priority + 1] $phpfpm_update_every
+CHART phpfpm_$m.connections '' "PHP-FPM Active Connections" "connections" phpfpm phpfpm.connections line $((phpfpm_priority + 1)) $phpfpm_update_every
 DIMENSION active '' absolute 1 1
 DIMENSION maxActive 'max active' absolute 1 1
 DIMENSION idle '' absolute 1 1
 
-CHART phpfpm_$m.requests '' "PHP-FPM Requests" "requests/s" phpfpm phpfpm.requests line $[phpfpm_priority + 2] $phpfpm_update_every
+CHART phpfpm_$m.requests '' "PHP-FPM Requests" "requests/s" phpfpm phpfpm.requests line $((phpfpm_priority + 2)) $phpfpm_update_every
 DIMENSION requests '' incremental 1 1
 
-CHART phpfpm_$m.performance '' "PHP-FPM Performance" "status" phpfpm phpfpm.performance line $[phpfpm_priority + 3] $phpfpm_update_every
+CHART phpfpm_$m.performance '' "PHP-FPM Performance" "status" phpfpm phpfpm.performance line $((phpfpm_priority + 3)) $phpfpm_update_every
 DIMENSION reached 'max children reached' absolute 1 1
 DIMENSION slow 'slow requests' absolute 1 1
 EOF
@@ -157,16 +157,16 @@ phpfpm_update() {
 		# write the result of the work.
 		cat <<EOF
 BEGIN phpfpm_$m.connections $1
-SET active = $[phpfpm_active_processes]
-SET maxActive = $[phpfpm_max_active_processes]
-SET idle = $[phpfpm_idle_processes]
+SET active = $((phpfpm_active_processes))
+SET maxActive = $((phpfpm_max_active_processes))
+SET idle = $((phpfpm_idle_processes))
 END
 BEGIN phpfpm_$m.requests $1
-SET requests = $[phpfpm_accepted_conn]
+SET requests = $((phpfpm_accepted_conn))
 END
 BEGIN phpfpm_$m.performance $1
-SET reached = $[phpfpm_max_children_reached]
-SET slow = $[phpfpm_slow_requests]
+SET reached = $((phpfpm_max_children_reached))
+SET slow = $((phpfpm_slow_requests))
 END
 EOF
 	done
diff --git a/charts.d/postfix.chart.sh b/charts.d/postfix.chart.sh
index d286f99f..f4f71027 100755
--- a/charts.d/postfix.chart.sh
+++ b/charts.d/postfix.chart.sh
@@ -43,9 +43,9 @@ postfix_check() {
 
 postfix_create() {
 cat <<EOF
-CHART postfix.qemails '' "Postfix Queue Emails" "emails" queue postfix.queued.emails line $[postfix_priority + 1] $postfix_update_every
+CHART postfix.qemails '' "Postfix Queue Emails" "emails" queue postfix.queued.emails line $((postfix_priority + 1)) $postfix_update_every
 DIMENSION emails '' absolute 1 1
-CHART postfix.qsize '' "Postfix Queue Emails Size" "emails size in KB" queue postfix.queued.size area $[postfix_priority + 2] $postfix_update_every
+CHART postfix.qsize '' "Postfix Queue Emails Size" "emails size in KB" queue postfix.queued.size area $((postfix_priority + 2)) $postfix_update_every
 DIMENSION size '' absolute 1 1
 EOF
 
diff --git a/charts.d/sensors.chart.sh b/charts.d/sensors.chart.sh
index 946de540..19e93858 100755
--- a/charts.d/sensors.chart.sh
+++ b/charts.d/sensors.chart.sh
@@ -129,7 +129,7 @@ sensors_create() {
 					files="$( sensors_check_files $files )"
 					files="$( sensors_check_temp_type $files )"
 					[ -z "$files" ] && continue
-					echo "CHART sensors.temp_$id '' '$name Temperature' 'Celsius' 'temperature' 'sensors.temp' line $[sensors_priority + 1] $sensors_update_every"
+					echo "CHART sensors.temp_$id '' '$name Temperature' 'Celsius' 'temperature' 'sensors.temp' line $((sensors_priority + 1)) $sensors_update_every"
 					echo >>$TMP_DIR/sensors.sh "echo \"BEGIN sensors.temp_$id \$1\""
 					divisor=1000
 					;;
@@ -138,7 +138,7 @@ sensors_create() {
 					files="$( ls $path/in*_input 2>/dev/null )"
 					files="$( sensors_check_files $files )"
 					[ -z "$files" ] && continue
-					echo "CHART sensors.volt_$id '' '$name Voltage' 'Volts' 'voltage' 'sensors.volt' line $[sensors_priority + 2] $sensors_update_every"
+					echo "CHART sensors.volt_$id '' '$name Voltage' 'Volts' 'voltage' 'sensors.volt' line $((sensors_priority + 2)) $sensors_update_every"
 					echo >>$TMP_DIR/sensors.sh "echo \"BEGIN sensors.volt_$id \$1\""
 					divisor=1000
 					;;
@@ -147,7 +147,7 @@ sensors_create() {
 					files="$( ls $path/curr*_input 2>/dev/null )"
 					files="$( sensors_check_files $files )"
 					[ -z "$files" ] && continue
-					echo "CHART sensors.curr_$id '' '$name Current' 'Ampere' 'current' 'sensors.curr' line $[sensors_priority + 3] $sensors_update_every"
+					echo "CHART sensors.curr_$id '' '$name Current' 'Ampere' 'current' 'sensors.curr' line $((sensors_priority + 3)) $sensors_update_every"
 					echo >>$TMP_DIR/sensors.sh "echo \"BEGIN sensors.curr_$id \$1\""
 					divisor=1000
 					;;
@@ -156,7 +156,7 @@ sensors_create() {
 					files="$( ls $path/power*_input 2>/dev/null )"
 					files="$( sensors_check_files $files )"
 					[ -z "$files" ] && continue
-					echo "CHART sensors.power_$id '' '$name Power' 'Watt' 'power' 'sensors.power' line $[sensors_priority + 4] $sensors_update_every"
+					echo "CHART sensors.power_$id '' '$name Power' 'Watt' 'power' 'sensors.power' line $((sensors_priority + 4)) $sensors_update_every"
 					echo >>$TMP_DIR/sensors.sh "echo \"BEGIN sensors.power_$id \$1\""
 					divisor=1000000
 					;;
@@ -165,7 +165,7 @@ sensors_create() {
 					files="$( ls $path/fan*_input 2>/dev/null )"
 					files="$( sensors_check_files $files )"
 					[ -z "$files" ] && continue
-					echo "CHART sensors.fan_$id '' '$name Fans Speed' 'Rotations / Minute' 'fans' 'sensors.fans' line $[sensors_priority + 5] $sensors_update_every"
+					echo "CHART sensors.fan_$id '' '$name Fans Speed' 'Rotations / Minute' 'fans' 'sensors.fans' line $((sensors_priority + 5)) $sensors_update_every"
 					echo >>$TMP_DIR/sensors.sh "echo \"BEGIN sensors.fan_$id \$1\""
 					;;
 
@@ -173,7 +173,7 @@ sensors_create() {
 					files="$( ls $path/energy*_input 2>/dev/null )"
 					files="$( sensors_check_files $files )"
 					[ -z "$files" ] && continue
-					echo "CHART sensors.energy_$id '' '$name Energy' 'Joule' 'energy' 'sensors.energy' areastack $[sensors_priority + 6] $sensors_update_every"
+					echo "CHART sensors.energy_$id '' '$name Energy' 'Joule' 'energy' 'sensors.energy' areastack $((sensors_priority + 6)) $sensors_update_every"
 					echo >>$TMP_DIR/sensors.sh "echo \"BEGIN sensors.energy_$id \$1\""
 					algorithm="incremental"
 					divisor=1000000
@@ -183,7 +183,7 @@ sensors_create() {
 					files="$( ls $path/humidity*_input 2>/dev/null )"
 					files="$( sensors_check_files $files )"
 					[ -z "$files" ] && continue
-					echo "CHART sensors.humidity_$id '' '$name Humidity' 'Percent' 'humidity' 'sensors.humidity' line $[sensors_priority + 7] $sensors_update_every"
+					echo "CHART sensors.humidity_$id '' '$name Humidity' 'Percent' 'humidity' 'sensors.humidity' line $((sensors_priority + 7)) $sensors_update_every"
 					echo >>$TMP_DIR/sensors.sh "echo \"BEGIN sensors.humidity_$id \$1\""
 					divisor=1000
 					;;
diff --git a/charts.d/squid.chart.sh b/charts.d/squid.chart.sh
index 5e1ebb06..f6154b25 100755
--- a/charts.d/squid.chart.sh
+++ b/charts.d/squid.chart.sh
@@ -63,21 +63,21 @@ squid_check() {
 squid_create() {
 	# create the charts
 	cat <<EOF
-CHART squid.clients_net '' "Squid Client Bandwidth" "kilobits / sec" clients squid.clients.net area $[squid_priority + 1] $squid_update_every
+CHART squid.clients_net '' "Squid Client Bandwidth" "kilobits / sec" clients squid.clients.net area $((squid_priority + 1)) $squid_update_every
 DIMENSION client_http_kbytes_in in incremental 8 1
 DIMENSION client_http_kbytes_out out incremental -8 1
 DIMENSION client_http_hit_kbytes_out hits incremental -8 1
 
-CHART squid.clients_requests '' "Squid Client Requests" "requests / sec" clients squid.clients.requests line $[squid_priority + 3] $squid_update_every
+CHART squid.clients_requests '' "Squid Client Requests" "requests / sec" clients squid.clients.requests line $((squid_priority + 3)) $squid_update_every
 DIMENSION client_http_requests requests incremental 1 1
 DIMENSION client_http_hits hits incremental 1 1
 DIMENSION client_http_errors errors incremental -1 1
 
-CHART squid.servers_net '' "Squid Server Bandwidth" "kilobits / sec" servers squid.servers.net area $[squid_priority + 2] $squid_update_every
+CHART squid.servers_net '' "Squid Server Bandwidth" "kilobits / sec" servers squid.servers.net area $((squid_priority + 2)) $squid_update_every
 DIMENSION server_all_kbytes_in in incremental 8 1
 DIMENSION server_all_kbytes_out out incremental -8 1
 
-CHART squid.servers_requests '' "Squid Server Requests" "requests / sec" servers squid.servers.requests line $[squid_priority + 4] $squid_update_every
+CHART squid.servers_requests '' "Squid Server Requests" "requests / sec" servers squid.servers.requests line $((squid_priority + 4)) $squid_update_every
 DIMENSION server_all_requests requests incremental 1 1
 DIMENSION server_all_errors errors incremental -1 1
 EOF
diff --git a/charts.d/tomcat.chart.sh b/charts.d/tomcat.chart.sh
index 5ca85e8c..f5a4cb99 100755
--- a/charts.d/tomcat.chart.sh
+++ b/charts.d/tomcat.chart.sh
@@ -61,14 +61,14 @@ tomcat_get() {
 # _create is called once, to create the charts
 tomcat_create() {
 	cat <<EOF
-CHART tomcat.accesses '' "tomcat requests" "requests/s" statistics tomcat.accesses area $[tomcat_priority + 8] $tomcat_update_every
+CHART tomcat.accesses '' "tomcat requests" "requests/s" statistics tomcat.accesses area $((tomcat_priority + 8)) $tomcat_update_every
 DIMENSION accesses '' incremental
-CHART tomcat.volume '' "tomcat volume" "KB/s" volume tomcat.volume area $[tomcat_priority + 5] $tomcat_update_every
+CHART tomcat.volume '' "tomcat volume" "KB/s" volume tomcat.volume area $((tomcat_priority + 5)) $tomcat_update_every
 DIMENSION volume '' incremental divisor ${tomcat_decimal_KB_detail}
-CHART tomcat.threads '' "tomcat threads" "current threads" statistics tomcat.threads line $[tomcat_priority + 6] $tomcat_update_every
+CHART tomcat.threads '' "tomcat threads" "current threads" statistics tomcat.threads line $((tomcat_priority + 6)) $tomcat_update_every
 DIMENSION current '' absolute 1
 DIMENSION busy '' absolute 1
-CHART tomcat.jvm '' "JVM Free Memory" "MB" statistics tomcat.jvm area $[tomcat_priority + 8] $tomcat_update_every
+CHART tomcat.jvm '' "JVM Free Memory" "MB" statistics tomcat.jvm area $((tomcat_priority + 8)) $tomcat_update_every
 DIMENSION jvm '' absolute 1 ${tomcat_decimal_detail}
 EOF
 	return 0
@@ -89,17 +89,17 @@ tomcat_update() {
 	# write the result of the work.
 	cat <<VALUESEOF
 BEGIN tomcat.accesses $1
-SET accesses = $[tomcat_accesses]
+SET accesses = $((tomcat_accesses))
 END
 BEGIN tomcat.volume $1
-SET volume = $[tomcat_volume]
+SET volume = $((tomcat_volume))
 END
 BEGIN tomcat.threads $1
-SET current = $[tomcat_threads]
-SET busy = $[tomcat_threads_busy]
+SET current = $((tomcat_threads))
+SET busy = $((tomcat_threads_busy))
 END
 BEGIN tomcat.jvm $1
-SET jvm = $[tomcat_jvm_freememory]
+SET jvm = $((tomcat_jvm_freememory))
 END
 VALUESEOF
 
diff --git a/tests/stress.sh b/tests/stress.sh
index 572dc7d1..d09d6989 100755
--- a/tests/stress.sh
+++ b/tests/stress.sh
@@ -17,10 +17,10 @@ if [ "${#charts[@]}" -eq 0 ]
 fi
 
 update_every="$(curl "$host/netdata.conf" 2>/dev/null | grep "update every = " | head -n 1 | cut -d '=' -f 2)"
-[ $[ update_every + 1 - 1] -eq 0 ] && update_every=1
+[ $(( update_every + 1 - 1)) -eq 0 ] && update_every=1
 
 entries="$(curl "$host/netdata.conf" 2>/dev/null | grep "history = " | head -n 1 | cut -d '=' -f 2)"
-[ $[ entries + 1 - 1] -eq 0 ] && entries=3600
+[ $(( entries + 1 - 1)) -eq 0 ] && entries=3600
 
 # to compare equal things, set the entries to 3600 max
 [ $entries -gt 3600 ] && entries=3600
@@ -35,8 +35,8 @@ formats=("jsonp" "json" "ssv" "csv" "datatable" "datasource" "tsv" "ssvcomma" "h
 options="flip|jsonwrap"
 
 now=$(date +%s)
-first=$[now - (entries * update_every)]
-duration=$[now - first]
+first=$((now - (entries * update_every)))
+duration=$((now - first))
 
 file="$(mktemp /tmp/netdata-stress-XXXXXXXX)"
 cleanup() {
@@ -50,22 +50,22 @@ do
 	echo "curl --compressed --keepalive-time 120 --header \"Connection: keep-alive\" \\" >$file
 	for x in {1..100}
 	do
-		dt=$[RANDOM * duration / 32767]
-		st=$[RANDOM * duration / 32767]
-		et=$[ st + dt ]
-		[ $et -gt $now ] && st=$[ now - dt ]
+		dt=$((RANDOM * duration / 32767))
+		st=$((RANDOM * duration / 32767))
+		et=$(( st + dt ))
+		[ $et -gt $now ] && st=$(( now - dt ))
 
-		points=$[RANDOM * 2000 / 32767 + 2]
-		st=$[first + st]
-		et=$[first + et]
+		points=$((RANDOM * 2000 / 32767 + 2))
+		st=$((first + st))
+		et=$((first + et))
 
-		mode=$[RANDOM * ${#modes[@]} / 32767]
+		mode=$((RANDOM * ${#modes[@]} / 32767))
 		mode="${modes[$mode]}"
 
-		chart=$[RANDOM * ${#charts[@]} / 32767]
+		chart=$((RANDOM * ${#charts[@]} / 32767))
 		chart="${charts[$chart]}"
 
-		format=$[RANDOM * ${#formats[@]} / 32767]
+		format=$((RANDOM * ${#formats[@]} / 32767))
 		format="${formats[$format]}"
 
 		echo "--url \"$host/api/v1/data?chart=$chart&mode=$mode&format=$format&options=$options&after=$st&before=$et&points=$points\" \\"
-- 
2.39.2