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$ cat A; echo '* * * * *'; cat B apple ... lime orange banana
$ perl -e 'open F,$ARGV[0] or die;shift;my %set = map {$_ => 1 } <>; f +or (<F>) {print if $set{$_}};' A B lime
$ perl -e 'open F,$ARGV[0] or die;shift;my %set = map {$_ => 1 } <>; f +or (<F>) {print unless $set{$_}};' A B apple cherry carrot
$ cat C grape ... $ perl -e 'open F,$ARGV[0] or die;shift;my %set = map {$_ => 1 } <>; f +or (<F>) {print if $set{$_}};' A B C cherry lime
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