Save Terminal Output command on OSX

Assuming command is the command you want to run, you can pipe it's output into the output.txt using:

$ command > output.txt

or

$ command | tee output.txt

If this doesn't hell it may be because the output is not printed on stdout but on stderr. The pipe > is implicit writing for 1> which means "pipe stdout to ...".
If you want to pipe stderr into the file too, you can use

$ command 2>&1 >output.txt

This first pipes all the output of stderr to the file-descriptor 1 (=stdout) which in tu is piped into the text file.

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