This should work for text files.
#!/usr/bin/perl -w
use strict;
my %acronyms_captured;
my $file = 'test.txt';
open FH, "<", $file or die;
while(<FH>){
my @words = $_ =~ m/\b[A-Z]+\b/g;
foreach(@words) { $acronyms_captured{$_} = undef; }
}
close(FH);
foreach(keys(%acronyms_captured)){ print "$_\n"; }
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