For example, if I have a statement:
/home/1/test.sh > /home/1/test.log 2>&1 What does the last part of this do effectively?
Thanks.
- @Freddy Yes, I didn't realize google had added symbols as meaningful search terms, that's my bad. Makes looking these things up a lot easier. Someone can close this question. Thanks!matt– matt2021-03-11 23:50:43 +00:00Commented Mar 11, 2021 at 23:50
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1 Answer
Greater than or 1 greater than means redirect stdout (standard output, what's usually written to the terminal. 2 greater than means redirect stderr (standard error).
In 2>&1, you are redirecting stderr AND (ampersand) stdout.
- In this case, where are you redirecting it to? Thanks!matt– matt2021-03-11 23:45:38 +00:00Commented Mar 11, 2021 at 23:45
- 1In the example you gave, you'd be redirecting it to the filename following >, so /home/1/test.log. Note that there is a more readable but less portable version of the above: /home/1/test.sh &> /home/1/test.log.Grace Thompson– Grace Thompson2021-03-11 23:46:54 +00:00Commented Mar 11, 2021 at 23:46
- Oh okay, I think I understand. So it's redirecting stdout to the file, then redirecting stderr to stdout, which is being redirected to the file, so both stdout and stderr are redirected to the log file. Is that correct?matt– matt2021-03-11 23:49:27 +00:00Commented Mar 11, 2021 at 23:49
- 1Yes, that's right.Grace Thompson– Grace Thompson2021-03-11 23:51:44 +00:00Commented Mar 11, 2021 at 23:51
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2>&1as such doesn't redirect stderr and stdout, though (that's what&>does). It redirects stderr to wherever stdout is pointing at that moment.DonHolgo– DonHolgo2021-03-12 10:26:05 +00:00Commented Mar 12, 2021 at 10:26