Process Information by PID

[Peter Hansen]

Thomas Guettler wrote:
> 
> I want to get some information about
> a process.
> 
> I know its PID, and I need
> to know the commandline.
> 
> I need something like:
> > ps -p $THISPID

Surely you've already considered using popen?  On the other hand,
using "-p" doesn't give me the command line for processes, just 
the name of the command itself.

What about reading from the /proc/$PID/cmdline pseudo-file ?

-Peter