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How can I concatenate the output of two commands?

How can I concatenate the output pwd

and ls

and add it to a file named f1? This does not work:

pwd, ls > f1
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3 answers


Use a compound command:



{ pwd; ls; } > f1
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Keeps half and 2 spaces, cost vs @chepner process :-)



(pwd;ls) > f1
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You may be looking for something more complex, but adding files is a simple solution:

pwd >> f1
ls >> f1

If you prefer Chepner's or Mark Setchell's answer, here's the explanation:

  • You can use a parenthesis subshell:

    ( pwd; ls; ) > f1

  • Or a subcommand:

    { pwd; ls; } > f1

With a subshell, the parent shell won't have access to the child's environment. The variable is not saved because a new orphan process is being created.

And with the subcommand, the initialized variable is preserved and can be used with parents.

Both have a parent environment.

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