[wplug] Bash scripting help - count from 1 to 4

[James O'Kane]

On Sat, 28 Jan 2006, Gentgeen wrote:

>
> I am writing a bash script as part of my backup routine. What I need
> to keep track of is which zip disk to use, Disk 1, 2, 3, or 4.
> (rotating the disks out once a week)

I'm not sure where you're getting stuck in this problem. The reading from 
file? The math? Here is something quick I came up with:

#!/bin/bash

x=`cat DISK`
echo "Before: $x"

x=$[ (($x) % 4) + 1 ]

echo "After: $x"

echo $x > DISK



It's horribly lacking in sanity checking. Such as verifying there is only 
one line and one character in DISK. But if you run it several times, it 
will count from 1 to 4 and start over.

-james