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Copy input sent to a command to stderr

Terminal - Copy input sent to a command to stderr
rev <<< 'lorem ipsum' | tee /dev/stderr | rev
2009-03-31 13:12:09
User: penpen
Functions: rev tee
2
Copy input sent to a command to stderr

In the above example 'muspi merol' (the output of the first rev command) is sent to stderr and 'lorem ipsum' (the output of the second rev command) is sent to stdout. rev reverse lines of a file or files. This use of tee allows testing if a program correctly handles its input without using files that hold the data.

Alternatives

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Terminal - Alternatives

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What others think

'echo 'lorem ipsum'| rev | tee /dev/stderr | rev' reads cleaner.

Comment by ozymandias 330 weeks ago

@ozymandias: Hint: "To include further commands, include them on a new line that starts with a $." also applies to comments, next time try using it because

echo 'lorem ipsum' | rev | tee /dev/stderr | rev

immediately sticks out as code.

Comment by penpen 330 weeks ago

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