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I wanted get the resout of ps command to a file like this. (in bash)

$ps -eax |& tee list1

and I see many lines from the ps command but the file list1 is empty.
How should I do it?

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13
  • what was the intention behind using |&? Commented Aug 31, 2022 at 12:48
  • I usually did to catch stderr too. Commented Aug 31, 2022 at 12:50
  • the problem is I can't reproduce this locally; my list1 is filled with the output of ps. So I thought maybe I was doing something wrong, and hence I asked for clarification. Commented Aug 31, 2022 at 12:54
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    Note that you need bash 4.0 or newer for |& (short for 2>&1 |, |& being a csh operator initially). In older versions, I'd expect a syntax error though. Commented Aug 31, 2022 at 12:55
  • maybe we need to do a sanity check on tee. What does type tee say? And tee --version? Commented Aug 31, 2022 at 12:55

1 Answer 1

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0

To get your desired logging in parallel to terminal output, you should change

$ps -eax |& tee list1

to

$ps -eax 2>&1 | tee list1

As suggested by the discussion, it is possible that the "|&" operator is not implemented in a universal fashion, causing discrepancies from one system to the next, or that it is reacting to unspecified environmental conditions.

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  • Hi, I tried $ps -eax |& tee list1 again and it works today! I don't know why. Commented Sep 20, 2022 at 3:01

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