Bash / sh
#!/bin/sh
#!/bin/bash
Cheatsheet
If
if [ "$INTERFACE" != "pppoe-wan" ]
then
exit
fi
- Operator: =, !=
Switch
# This script does a very simple test for checking disk space.
space=`df -h | awk '{print $5}' | grep % | grep -v Use | sort -n | tail -1 | cut -d "%" -f1 -`
case $space in
[1-6]*)
Message="All is quiet."
;;
[7-8]*)
Message="Start thinking about cleaning out some stuff. There's a partition that is $space % full."
;;
9[1-8])
Message="Better hurry with that new disk... One partition is $space % full."
;;
99)
Message="I'm drowning here! There's a partition at $space %!"
;;
*)
Message="I seem to be running with an nonexistent amount of disk space..."
;;
esac
Tips
Output binary data
# Only work in bash. DO NOT work in sh!
echo -n -e '\x01\x02' > file