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I have a series of commands running through a pipeline like this:

cmd1 | cmd2 | cmd3 | cmd4

How can I print the intermediate result of cmd1, cmd2 and cmd3? I know I can use the tee command to print the result to a file. But is it possible to just print it to the console? This is for debugging purpose as my actual commands are very complex.

1 Answer 1

Reset to default
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You can tee to the current terminal:

cmd1 | tee /dev/tty | cmd2 | tee /dev/tty | cmd3 | tee /dev/tty | cmd4
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  • Thank you! This works. Do you know is it possible to let tee's print result on its own line?
    – Just a learner
    May 14, 2020 at 9:49
  • I’m not sure I understand the question. Do you want to be able to distinguish the output from multiple tees, or distinguish the teed output from cmd4’s output?
    – Stephen Kitt
    May 14, 2020 at 9:55
  • I want to be able to distinguish the output from multiple tees.
    – Just a learner
    May 14, 2020 at 9:56
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    I think that should be possible by redirecting tee’s extra output to new file descriptors, and then decorating those outputs with ts or something similar, but my shell-fu in that area is weak.
    – Stephen Kitt
    May 14, 2020 at 16:24

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