I have to write a script that collects user id and PID information, but I don't
know what PID means. Can anyone give me a brief explanation of what PID stands for, thanks.

PID = Process IDentifier

man bash
/PID
for details



Cheers,
Tink

Thanks.

If I want to display the just the PID information using the ps command in bash, how would I do that?

The PID of what would be the first thing you should
try to find out ;)

And then of course there's friendly commands like cut
and awk that will let you post-process the information
out of ps if the built-in display options don't quite do
what you expect.

man ps
man cut
man awk

for details



Cheers,
Tink

P.S.: And since the question strongly reeks of homework
this is going to be as much support as you get, homework
questions are against our rules. If you run into an actual
problem with any of the commands above feel free to come
back and ask.

When I try to use the "pidof" command, bash says the command is not found.
How do I enable the "pidof" command in my bash shell?

pidof is part of the sysinitV package in slackware, and
is in /sbin ... chances are that you can't see it as a normal
user in your distro, either. Have a look in /sbin, or see
whether it works as root.

If it doesn't, use ps and grep, gives you the same info
with slightly more work.


Cheers,
Tink

Thanks, I checked in /sbin, and pidof was there, it was one of a few commands that was highlighted a different color, I am not sure what that means. Possibly that command is disabled?

Personally I don't use ls colorisation, and if I did the
meaning of the colours in your set-up might differ from
what my distro provides. The easiest way to find out
would be to try and run it ;}


Cheers,
Tink