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    0: #!/usr/bin/perl
    2: # Simple program to remove duplicate email messages
    3: # from an mbox file. This program only looks at the content
    4: # of the message for uniqueness, not entire message with the headers.
    5: # There is no file locking, use this program on a backup 
    6: # of your mbox file.
    7: # Enjoy.
    9: use strict;
    10: use warnings;
    11: use Digest::MD5 qw(md5_hex);
    13: #grab file names from the program parameters.
    14: #and do some error checking.
    15: my ($from, $to) = @_;
    16: die "usage: $0 from to" unless (defined $from && defined $to);
    17: my (%uniq, $msg);
    18: my ($head, $body);
    19: my $i = 0;
    21: $|++;
    23: open (my $fh, "<$from") || die "cannot open $from: $!";
    24: while(<$fh>) {
    25: 	#emails in mbox files always begin with ^From 
    26: 	#when /^From / is matched, process the previous message
    27: 	#then start on this message
    28: 	if(m/^From /) {
    29: 		next if ($msg eq "");
    30: 		#increment the counter for a status report
    31: 		$i++;
    32: 		#print a status report if necessary.
    33: 		#I like to do it this way
    34: 		print '.' if(($i % 50) == 0);
    35: 		print " $i\n" if(($i % 1000) == 0);
    36: 		#since evolution can give different headers on the same message,
    37: 		#only hash the body of the message, and use that to compare to other
    38: 		#emails. The entire message will be stored in the hash though.
    39: 		($head, $body) = split /\n\n/, $msg;
    40: 		#standard perl technique for removing duplicates, using hashes and 
    41: 		#md5 files.
    42: 		$uniq{md5_hex($body)} = $msg;
    44: 		#done processing the previous message, start the next message
    45: 		$msg = $_;
    46: 	} else {
    47: 		#current line didn't match /^From / so this line is part of the
    48: 		#middle of the current message. Just tack it on to the end.
    49: 		$msg .= $_;
    50: 	}
    51: }
    53: #print the results to a file.
    54: open (my $th, ">$to") || die "cannot open $to: $!";
    55: while(my ($k, $v) = each %uniq) {
    56: 	print $th $v;
    57: }

In reply to Remove Duplicates from a mbox file by coolmichael

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