When viewing the cron entries- (user) are not allowed to use this program (crontab)

When viewing the cron entries-  (user) are not allowed to use this program (crontab)

Error:

"crontab -l" for non root or oracle user fails with following error:

$ crontab -l

You (user) are not allowed to use this program (crontab)

Reason:

Incorrect permissions for /usr/bin/crontab

Below shows the correct permissions. 

Setuid permission is needed for /usr/bin/crontab as shown below:

# ls -l /usr/bin/crontab

-rwsr-xr-x. 1 root root 57664 Apr 19 16:16 /usr/bin/crontab

Solution:

Add setuid permission 

# chmod u+s /usr/bin/crontab

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