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Re^3: (thoughts on) Detect common lines between two files, one liner from shell

by Anonymous Monk
on Dec 23, 2004 at 18:31 UTC ( [id://417182]=note: print w/replies, xml ) Need Help??


in reply to Re: Re: (thoughts on) Detect common lines between two files, one liner from shell
in thread Detect common lines between two files, one liner from shell

This should also work for an arbitrary number of files, which AFAIK has no equivalent UNIX command. To show common lines in 4 files: perl -ne 'print if ($seen{$_} .= @ARGV) =~ /32+1+0$/' fileA fileB fileC fileD
  • Comment on Re^3: (thoughts on) Detect common lines between two files, one liner from shell

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Re^4: (thoughts on) Detect common lines between two files, one liner from shell
by shmem (Chancellor) on Jun 22, 2007 at 23:55 UTC
    The generalized form would be (golfed down a bit) for any number of files 
    perl -ne'BEGIN{$p.=-$_."+"for-@ARGV+1..-1;$p.=0}print if($s{$_}.=@ARGV
+)=~/$p$/'

    [download]

    --shmem 

    _($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}
[reply]
[d/l]

In Section Cool Uses for Perl

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