Re^3: (thoughts on) 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]

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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

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]