Installation class action script (i.cron)

   # PKGINST parameter provided by installation service
   

   while read src dest
   do
           user=`basename $dest` ||
                   exit 2
   

           (crontab -l $user |
           sed -e "/#$PKGINST$/d" > /tmp/$$crontab) ||
                   exit 2
   

           sed -e "s/$/#$PKGINST/" $src >> /tmp/$$crontab ||
                   exit 2
   

           crontab $user < /tmp/$$crontab ||
                   exit 2
           rm -f /tmp/$$crontab
   done
   exit 0