#! /bin/sh

# Example showing the use of temporary files, and automatic removal
# with a trap handler

prog=$(basename $0)
TMPFILE=$(mktemp /tmp/${prog}.XXXXXX) \
|| { echo Cannot make tempfile; exit 1; }
trap "rm $TMPFILE; exit" HUP INT QUIT PIPE ALRM TERM
echo Your file is $TMPFILE
lastb root > $TMPFILE
# Now process and sort TMPFILE in different ways,
# then finally remove it