Backup script not working properly

[Brian Dessent]

Fredrik Persson wrote:

> All works but for the last for-loop which is responsible for deleting old
> backups such that only NUMBKPS=4 of the last backups are stored.
> 
> The problem is in 'if [ ${num} -le 0 ]' and 'else num=$((${num}-1))'. It seems
> like the num-variable can't be used as an integer. Any suggestions how to fix
> this???

On Linux, /bin/sh is /bin/bash.  This is not the case on Cygwin and
other *nixs.  The "$((...))" thing is a bash feature/extension I think,
and not found in the standard Bourne shell.  Try using the expr command
instead to do math, or change the shebang to call bash explicitly.

Brian

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