#!/bin/bash umask 0022 unset IFS unset OFS unset LD_PRELOAD unset LD_LIBRARY_PATH export PATH='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' check_user() { if [ "root" != "`whoami`" ]; then echo "Only root can execute this script" exit 1 fi } ### Main Begin ### check_user dir="$( cd $( dirname $0 ) && pwd )" line="$dir/start.sh" (crontab -u root -l | grep -v "$line") | crontab -u root - ### Main End ###