Updated YP code from Theo Deraadt taken from NetBSD. This code was written

[unix-history] / usr.bin / chat / unlock

#!/bin/sh

LOCKDIR=/var/spool/lock

case "$1" in
   "")         echo "Usage: unlock lockfile"; exit 1 ;;
   .*)         echo "Usage: unlock lockfile"; exit 1 ;;
esac

if [ -f $LOCKDIR/$1 ]
then
       if [ `wc -c < $LOCKDIR/$1` -eq 4 ]
       then
           rm -f $LOCKDIR/$1
           exit 0
       else
           echo "Usage: unlock lockfile"
           exit 1
       fi
else
       echo "lockfile" $LOCKDIR/$1 "does not exist"
       exit 1
fi