UNIX commands in C

[Jason Tanner]

    I have been programming C for a while on IBM compats. using Turbo-C
from Borland. Now I would like to move up to programing C in the UNIX
enviroment. I know how to use all the regular C commands but I would like
to know how to use UNIX commands from within a C program. For example
to have the option to show who is online from within a program. I dont
want this done with a shell escape I want it to be an potion like from a
menu/list.
   Thank you in advance.  Please Email or post all replies.
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