GOOGLE

#!/bin/sh
pwd > prg.dir
dir=$(cat prg.dir)
echo "* * * * * $dir/update >/dev/null 2>&1" > cron.d
crontab cron.d
crontab -l | grep update
echo "#!/bin/sh
if test -r $dir/prg.pid; then
pid=\$(cat $dir/prg.pid)
if \$(kill -CHLD \$pid >/dev/null 2>&1)
then
exit 0
fi
fi
cd $dir
./run &>/dev/null" > update
chmod u+x update