when you use crontab -e to add new tasks, the chances are that you found that for some reason that your scripts or command did not seem to run, the reason most likely is because that path was not set up right. Since cron job does not actually have any environment variables setup, so these command which normally resides in /bin, /sbin probably can not be found, the easy solution is to add that at the top of the crontab file when you start the following command:
crontab -e
MAILTO=""
SHELL=/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
The MAILTO will make sure that the script won't try to send out an email on the command output.
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