Ulimit privilege for a user
 

How can I give a ulimit privilege to a particular user.

You mean make them root?

I tried

ulimit -u biggervalue

but works only with root how can I give that privilege to a user or a group?

Thanks

ulimit is actually an obsolete command. But if your trying give a user access to this command, either change the permissions of this command or setup sudo for any particular users.