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You may have to set the paths to search for executables in the script since this will most likely not be set, or you can specify the full path to all programs called from the script (instead of mybackup.sh use /usr/local/bin/mybackup.sh).
You need to set the path at the beginning of your script. The environment variable $PATH contains a comma-separated list of the directories that are to be searched for executables. Type echo $PATH to see what directories are currently in your $PATH.
You set it like this: PATH=dir1:dir2:dir2
...or for a more real-world like example: PATH=/bin:/usr/bin:/usr/local/bin:~/bin
You can also tack on a directory to the existing $PATH by including $PATH itself in the list of directories to be used: PATH=$PATH:/opt/myownstuff/bin:/home/jenny/bin
Simply adding the PATH= entry with the directories you need at the top of the script, after the magic line (#!/bin/bash or whatever) but before any real stuff gets done should let you use the programs in the directories you specified without using their full paths.
On a related but not really relevant note, I usually use this in my ~/.bashrc: alias path='echo -e ${PATH//:/\\n}'
This provides me with the command path that will print the current $PATH in a more readable format - one directory per line.
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