Edit file: /var/spool/cron/crontabs/root
39 0 * * * /vmfs/volumes/datastore1/tools/ghettoVCB/start_ghettoVCB.sh -a
Restart crontab job after updating configuration file
After editing the crontab you also need to kill and restart the crond process, which you can do like this:
kill -HUP $(cat /var/run/crond.pid)
/usr/lib/vmware/busybox/bin/busybox crond
Make it persistent
Edit file /etc/rc.local.d/local.sh
/etc/rc.local.d/local.sh
/bin/echo "39 0 * * * /vmfs/volumes/datastore1/tools/ghettoVCB/start_ghettoVCB.sh -a" >> /var/spool/cron/crontabs/root