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#!/bin/sh -
#
# tmpdir_dir_hack.sh
#
# An example of the classic tmpdir hack
# to avoid race conditions.
#
# Use this method if you are on a Unix-like
# system which does not have a mktemp utility



umask 077
DIRNAME=/tmp/foo.$$
if ! mkdir $DIRNAME ; then
            echo "temporary directory already exists, possible attack"
            exit 255
fi
 
TMPFILE=$DIRNAME/tmp.$$


date > $TMPFILE		# for example

( The actual script goes here. )

rm -rf $DIRNAME