Set intersection and complement one-liners.
$ cat A; echo '* * * * *'; cat B
apple
cherry
carrot
lime
* * * * *
lime
orange
banana
A ∩ B
Intersection of A and B.
$ perl -e 'open F,$ARGV[0] or die;shift;my %set = map {$_ => 1 } <>; f
+or (<F>) {print if $set{$_}};' A B
lime
B / A
Complement of B relative to A.
$ perl -e 'open F,$ARGV[0] or die;shift;my %set = map {$_ => 1 } <>; f
+or (<F>) {print unless $set{$_}};' A B
apple
cherry
carrot
The first argument is always set A. The union of all the other arguments is set B. Thus:
$ cat C
grape
apricot
cherry
$ perl -e 'open F,$ARGV[0] or die;shift;my %set = map {$_ => 1 } <>; f
+or (<F>) {print unless $set{$_}};' A B C
apple
carrot
$ 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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