Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW
 
PerlMonks  

Re^3: Sort directory by file size

by graff (Chancellor)
on May 19, 2016 at 02:04 UTC ( #1163395=note: print w/replies, xml ) Need Help??


in reply to Re^2: Sort directory by file size
in thread Sort directory by file size

(1) When you want to post a chunk of code (or data) at the Monastery, start by typing these two lines into the composition box:

<c>

</c>

Then paste your code (or data) into the space between those two tags; you won't need to muck with anything else in order to get the code (or data) to show up correctly when posted. (Don't forget to put your paragraphs of explanation outside the code tags.)

2. Since you want to use file size to determine when to do md5 checksums, I think it would make more sense to build of a hash of arrays keyed by byte count: for each distinct byte count, the hash key is the size and the hash value is an array holding files of that size. Then loop over the hash and do md5s for each set of two or more files with a given size. You don't really need to do any sorting - just keep track of the different sizes. Here's how I would do it (on a unix/linux system):

#!/usr/bin/perl use strict; use warnings; use Digest::MD5; die "Usage: $0 dir1 dir2\n" unless ( @ARGV == 2 and -d $ARGV[0] and -d $ARGV[1] ); my %fsize; for my $dir ( @ARGV ) { opendir DIR, $dir or die "$dir: $!\n"; while ( my $fn = readdir DIR ) { next unless -f "$dir/$fn"; push @{$fsize{ -s "$dir/$fn" }}, "$dir/$fn"; } } my %fmd5; my $digest = Digest::MD5->new; for my $bc ( keys %fsize ) { next if scalar @{$fsize{$bc}} == 1; for my $fn ( @{$fsize{$bc}} ) { if ( open( my $fh, "<", $fn )) { $digest->new; $digest->addfile( $fh ); push @{$fmd5{ $digest->b64digest }}, $fn; } } } for my $md ( keys %fmd5 ) { print join( " == ", @{$fmd5{$md}} )."\n" if ( scalar @{$fmd5{$md}} + > 1 ); }
(That just lists sets of files that have identical content; you can tweak it do to other things, as you see fit.)

Replies are listed 'Best First'.
Re^4: Sort directory by file size
by nnigam1 (Novice) on May 19, 2016 at 19:27 UTC
    Thank you o Wise Ones.
    Fantastic suggestions. I am incorporating them.
    This is a way I had not thought of. It should definitely improve performance.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1163395]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (6)
As of 2021-03-04 23:02 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My favorite kind of desktop background is:











    Results (108 votes). Check out past polls.

    Notices?