[ale] How to Increment a number in a config file?

[Gary at EdisonInfo.com (Gary MacKay)]

I need to increment a number in a config file. The file contains:

{Rollout]
SerialNumber=67

All I want to do is increment the SerialNumber. I have gotten this far:

#!/bin/sh
SN=`cat sav.cfg | awk '/SerialNumber/ {split($1,a,"=");a[2]+=1;print
a[2]}'`
echo "[Rollout]" > test.cfg
echo "SerialNumber=$SN" >> test.cfg

This of course creates a whole new file, which then presents a problem
with ownership and perms. I could add a couple of lines to put the perms
back but... Is there a way to simply increment without messing up the
perms and such? This is a simple situation, but what if the file was a
huge one? Obviously I wouldn't want to make a whole new one each time.

TIA,
Gary
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