how to set ip address in shell?

as captioned

I have no idea what you are asking, so I will take a guess.

You want to set up a static IP for a *nix (Unix or Linux) box on your network?

Well, it depends on your specific OS; all seem to have differing "shortcuts", or internal applications to handle this. However, the old standby is of course, ifconfig -- for the short term. (In Suse, it's /etc/sysconfig/network/<interfacename>, in BSD it's /etc/rc.conf, in Fedora they have a window; actually, there's multiple methods even to each distribution. )

I suggest you clarify what it is you are asking for, and in the response provide additional details which may be pertinent.

Cheers.

use the netconfig command

This might help too:
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That would be dandy -- if he/she happened to be running a distro that contained said command.

How about we find out what he or she is running, before we get too specific?