Unix command to find lines common in two files

Posted by too much php on Stack Overflow See other posts from Stack Overflow or by too much php
Published on 2008-12-17T06:36:55Z Indexed on 2010/05/29 12:12 UTC
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unix

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shell

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command-line

I'm sure I once found a unix command which could print the common lines from two or more files, does anyone know its name? It was much simpler than diff.

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