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