Notably, /bin/sh on Debian is generally dash now, not bash.
-#!/bin/sh
+#!/bin/bash
# _update_every is a special variable - it holds the number of seconds
# between the calls of the _update() function
-#!/bin/sh
+#!/bin/bash
# the URL to download apache status info
apache_url="http://127.0.0.1:80/server-status?auto"
-#!/bin/sh
+#!/bin/bash
# if this chart is called X.chart.sh, then all functions and global variables
# must start with X_
-#!/bin/sh
+#!/bin/bash
# http://dev.mysql.com/doc/refman/5.0/en/server-status-variables.html
#
-#!/bin/sh
+#!/bin/bash
# if this chart is called X.chart.sh, then all functions and global variables
# must start with X_