Sometime on Jun 27, Kanti Jadia assembled some asciibets to say:
I need to set the ulimit parameter for all the users so that it is fairly large(Linux kernel 2.2.14). The problem is if i do the same for root than it is done easily,but when it comes to user x,it is giving me Operation not permitted.Can i set it globally for all users.
You have to check two things.
My guess is that you are trying to set it through ulimit -c 1000000 in /etc/profile, which is generally the default set there. The problem is that ulimit takes values in 1024-byte increments and not 1 byte increments as is assumed by the above command. Just remove three zeroes from what you want and it should work.
Another place to check is /etc/security/limits.conf
You can set the limits for many things from there, again in 1024 byte blocks.
Philip