Cron job running for some days and is not running for some days

Hi.. i have written a shell script and made this script to run on every day night 11: 55 pm using a cron job.

This cron job running for some days and is not running for some day. but i need this script to run every day night. Please help me.

Here is the cron tab entries,

55 23 * * * /path/sample.sh | mail -s "ouput" mail id

Thanks in advance.

Your cron tab entries look fine, what do you mean by not running, did you get any error in you cron logs ?

was the server running during those failed days ?