remove outdated files based on minor build number

I've created a script to remove old installation file based on the minor build number.

In one project I'm working on, we need to keep the file with the largest build number. Here's a sample to check which build number is the latest one.

for file in `find . -name \*$ESBPREFIX\*.isvp`

do

# echo $file

NAMELENGTH=`expr length $file`

POSITION=`expr $NAMELENGTH - 7`

ESBVERSION=`expr substr $file $POSITION 3`

if [ `expr index $ESBVERSION "."` -eq 1 ]; then

ESBVERSION=`expr substr $ESBVERSION 2 2`

fi

if [ `expr index $ESBVERSION "."` -eq 2 ]; then

ESBVERSION=`expr substr $ESBVERSION 3 1`

fi

# echo "[CO Build Number: $ESBVERSION]"

if [ $ESBVERSION -gt $MAXESBBDNR ]; then

MAXESBBDNR=$ESBVERSION

fi

done