How to "tee" stderr

stevensw · #1 04-20-2011

In other words, print on both the screen and to a file (minus stdout)? Thanks again in advance

pflynn · #2 04-20-2011

If your shell is Bash (or similar), this set of redirections will do the job:

Code:

$ command 3>&1 1>&2 2>&3 | tee file

shamrock · #3 04-20-2011

Quote:

Originally Posted by stevensw

In other words, print on both the screen and to a file (minus stdout)? Thanks again in advance

Redirect stderr to stdout then redirect stdout to /dev/null and then pipe tee to filename...sequence is important i.e. redirecting stderr to stdout comes before piping stdout to /dev/null. Thogh there is no need for swapping stdout with stderr as the following is ok...

Code:

cat valid_filename invalid_filename 2>&1 1>/dev/null | tee output_filename

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