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

save stderr only to a file

taken from http://www.unix.com/shell-programming-scripting/158311-how-tee-stderr.html " What does it mean? The redirection operator n>&m makes file descriptor n to be a copy of file descriptor m. So, whe are: - Opening a new file descriptor, 3, that is a copy of file descriptor 1, the standard output; - Making file descriptor 1 a copy of file descriptor 2, the standard error output; - Making file descriptor 2 to be a copy of file descriptor 3 (the "backup" of the standard output) in a short: we swapped the standard output and the standard error output. "

1
By: hute37
2012-10-30 10:53:21

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What Others Think

Some versions of 'tee' require that you use the -a switch to append to your output file rather than overwrite it, if you are saving to a file use: command 3>&1 1>&2 2>&3 | tee -a file
netkill · 289 weeks and 6 days ago

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Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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