#!/bin/sh
 
#
#	Compute a new version string for a shell script if the script has
#	been changed since the last time this script was run.
#
 
FILE=$1
 
old=`grep "^MD5SUM=" $FILE | sed -e 's/.*=//' -e 's/"//g'`
cur=`grep -v "^MD5SUM=" $FILE | md5sum`
 
if [ "$old" != "$cur" ]; then
ed -s $FILE -- <<EOF
g/^VERSION=/d
g/^MD5SUM=/d
1a
VERSION="`date` <`id -nu`@`hostname`>"
.
w
q
EOF
 
ed -s $FILE -- <<EOF
1a
MD5SUM="`md5sum <$FILE`"
.
w $FILE
q
EOF
fi