i could actually run some of the commands on my server such has unpacking a tar file , directory listing etc.
i did try installing gcc on some other folder (othe than usr/bin), but i think i didnt had the privilgegs to use make command.
if Someone could please tell if i can run any compiler from my server it will be greatly appreciated.
Pretty much any compiler will require Exec or ShellExec since it has to run an executable.
I should point out as well that even if you -do- manage to get it to run, it'll likely cause a high resource usage suspension and end up killing your site for a while.
That being said, unpacking a tar file is probably similar to unpacking a zip and can be done via cpanel anyways, so that'd make sense to be allowed. Same goes for a directory listing - can do that via PHP if you wanted.
But unless you're using an x10 VPS, you won't be able to run any compiler without it also causing a high resource suspension. For more information I'd file a support ticket, although the answer's likely going to be "exactly -what- do you need this for?" followed by "No."