The way I've always done this (and there are probably better ways).. 
#!/usr/bin/perl -w
use strict;

my @words;
my %list;

unless ($ARGV[1]){
    print "Usage is oneword infile outfile\n";
    exit;
}
open (WORDLIST, "$ARGV[0]")||die "Could not open file $!";
open (OUTFILE, ">$ARGV[1]")||die "Could not open file $!";
while (<WORDLIST>){push (@words => $_)}
foreach (@words){$list{$_}=$list{$_}} #this works because if the hash 
+key
                                      #exists already it is replaced!
foreach (keys %list){print OUTFILE;}

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In reply to Re: File Checking by the_slycer
in thread File Checking by Anonymous Monk

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