How to redirect command line outputs to a file, but still show them in the command line?

Question

In tcsh I want to redirect command line outputs to a file, but I still want to show them in the command line.

Did a little bit search that

./MyCommand.sh 2>&1 | tee /tmp/Output.txt

should do the job. But I got an error like:

Ambiguous output redirect

Answer 1

Use of 2>&1 to combine stderr and stdout works only in bash and sh. It does not for csh or tcsh. A work around is suggested at Redirect stdout to stderr in tcsh.

Answer 2

In bash instead of 2>&1 I use |& Not sure how this plays out for tcsh, but this question isn't currently tagged for it and hoping this helps someone else.

According to this redirect stderr to stdout in c shell you can't do this in csh which tcsh extends which could be related

Answer 3

It isn't clear from the question if you want to redirect stdout only, or stdout and stderr.

Using | will redirect stdout to tee (which outputs it to a file and to terminal), leaving stderr untouched (so it only goes to terminal):

./MyCommand.sh | tee /tmp/Output.txt

Using |& will "merge" stdout and stderr, and tee will redirect both to file and to terminal:

./MyCommand.sh |& tee /tmp/Output.txt