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

In reply to Re^3: (thoughts on) Detect common lines between two files, one liner from shell by Anonymous Monk
in thread Detect common lines between two files, one liner from shell by merlyn

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