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How do I find out the return value of a shell script or program in Unix?

Is there a command to find that out??

I want to save the contents of a variable to a file. How can that be achieved?
I have tried with:

echo $varname > textfile.txt

but for some reason it does not print anything.

I know what a named pipe is!

What I am doing is a chat program, I am transmitting the messages between users through the named pipes. I want to send to a file the contents of the pipe, in order to...

I want to copy the contents of a named pipe to a file. I have tried using:

cat pipe.p >> transcript.log

but I have been unsuccessful, any ideas?

I want to list the contents of a directory, but I do not want to use the ls, is there another way??