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I have one file that contains a list of files from a server, and a local folder that I compare to that manifest. Obviously, I do 'ls -1 > listing_local' and then diff that file with listing_server.

But is it possible to diff the manifest and the output of ls immediately to the diff command?

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4 Answers 4

Reset to default
4

In bash:

diff listing_server <(ls -1)
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3

You can pipe the output of a unix command into the input of another. 

ls -1 | diff file_goes_here -
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  • this won't work
    – user1931
    Jan 27, 2010 at 15:18
  • Now it does. That's what I get for not testing it first.
    – Josh K
    Jan 27, 2010 at 16:01
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diff listing <(ls -1)
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ls -1 | diff listing_server -
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1
  • The -1 is unnecessary if the output is not to a terminal.
    – Peter Eisentraut
    Jan 27, 2010 at 16:42

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