I am a user and I am not able to add/edit crons.
 

I am a user of a Linux Server and whenever I try to edit crons. I get this error.
Even if I want to see the cron list, it says
Root says I have a full permission to add/edit cron. I can't argue with him neither I can get any help from him.

It is sure that I am not able to create it in proper manner, it must be my mistake. I am missing something.

Please tell me what should I do to get permission to add edit crons.

I have found this error on google but it gives solutions of these error and it is not helping me.
Output of
$ ls -l /usr/bin/crontab
I do not have sudo previleges.

Thank you very much !

There is no setuid bit. Naturally normal user cant run crontab

Since you mentioned that you do not have any sudo priviledges then as a normal user you can't edit crontab like root do.

However, you can edit you own crontab entries using:

I'm not sure with no setuid, you can run 'crontab -e' either. atleast its not possible in my linux box(CentOS 6.4).

Only way is to tell the SU, to set setuid, which is the normal permission for /usr/bin/crontab

crontab -e is not working for me, it shows
If I execute crontab -l, it says
@mddesai
The command you have suggested shows
I think changing permission is not a task of user, may be root can do it. I am sending him request to allow it for me.

Are you sure, there is no other way to set cron by my own. I am asking because
I have already done some silly mistakes before and the tasks could be easily done by me, I have requested to root through mail and he has done on my system to show how could I do them.
Now this time I don't want to be novice. That's why I was asking :(

Thanks to all of you for your kind help.

@unclesamcrazy

The command i suggested should be run as root. since you executed it as normal user, it failed.

As for setuid bit, i cross checked it with fresh copy of centos6.4 and ubuntu 10.04

In CentOS, crontab's owner/group is root, and setuid is set for user root.
In Ubuntu, however, there is seperate crontab group, and setuid is set to it.
So, for Redhat variants, to set setuid for crontab, as root user,
For Ubuntu, to set setuid for crontab, as root user,

Thanks mddesai for your solution.

I tried this yesterday on my home system because I can not do this on company server.

I had installed ubuntu on my system so when I logged in as a user and tried to set cron, I faced same problem. because the permission of the file was
then I changed into
Now it worked, but if I set as
It does not work, now again I set as
It worked again. So It worked for two conditions and does not work for other two.
I don't know If these working two will work on CentOS or other two or only one will work what you mentioned above. I can't check on CentOS.