example_crontab_entries.sh

0,15,30,45 * * * * /Users/andrew/bin/start_cijoe > /dev/null 2>&1
0,15,30,45 * * * * /Users/andrew/bin/start_cijoe_tunnel > /dev/null 2>&1

start_cijoe.sh

#!/bin/sh

app_command="cijoe /Users/andrew/dev/webapp"
lock_file="/Users/andrew/dev/webapp/.git/cijoe.lock"

if [ ! -e $lock_file ]
then
	touch $lock_file
	$app_command
	rm -rf $lock_file
else
	echo "Lock file ($lock_file) exists"
fi