#!perl
use strict;
use warnings;
# The final hash
my %all;
# process files one by one, gather lines from each
foreach (@ARGV) {
my $hash = unique_in_file($_);
$all{$_}++ for keys %$hash;
};
# print result
print "$_\n" for grep {
$all{$_} == @ARGV; # don't hardcode the needed count, the number
+of files *will* change
} sort keys %all;
sub unique_in_file {
my $fname = shift;
# don't bother opening
local @ARGV = ($fname);
# do the same uniq(1) but for the current file
my %uniq;
while (<>) {
chomp;
# preprocess line here
$uniq{$_}++;
};
# could've returned array as well
return \%uniq;
};
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