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Suppose I ran some command, and now want to save the output of that previous command to a text file (without re-running the command, of course, there's no reason to assume it's idempotent).

Is there some simple way to get that output of the previous command?

echo <magic_for_last_output> >file.txt
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No, there isn't a way to save the last command's output to a file, as far as I know. The shell doesn't store that information.

However, you can hit the up arrow and add the redirection to the end of the last command, so you don't have to type anything new.

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