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You don't make it clear whether all these files are in a single directory, or in a directory heirarchy. I'm going to assume the former. Most shell commands and much perl code will appear to hang forever, since it will attempt to read the entire directory listing into memory, then sort it, before doing anything else. What you need (in general terms) is the following perl code, which must be run from the directory in question:
#!/usr/bin/perl use warnings; use strict; opendir my $dir, '.' or die "opendir .: $!\n"; my $file; my $count = 0; while (defined($file = readdir($dir))) { # give yourself some progression feedback $count++; print "file $count ...\n" unless $count % 1000; # skip all files not begining with b next unless $file =~ /^b/; # if you've created directories, may need to skip them; # this will slow things down, so don't do so unless necessary next unless -f $file; # do something with the file rename $file, "b/$file" or die "rename $file b/$file: $!\n"; }
This example deals with directory entries at the most efficient and lowest level. In this case, it just moves all files starting with "b" into the subdirectory b/.

Obviously it needs adapting to your particular needs. For example, the rename could become

system "gzip", $file;

Dave.


In reply to Re: Finding and sorting files in massive file directory by dave_the_m
in thread Finding and sorting files in massive file directory by CColin

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    [Discipulus]: good morning Corion!
    [Corion]: I spent parts of yesterday digging into Filter::Simple to make it not change the line numbers of unfiltered code, but I think I need regex help (which will come in a SoPW I guess). I tried @lines = /((?:"...."|[^" \n]+)\n)/gs, but that matched on...
    [Corion]: ... foo "\0\0\0\n" bar\n by matching the first \n instead of matching the four-bytes-in- double-quotes part
    [Corion]: ... and I still don't understand why ;)
    [Corion]: This is because Filter::Simple does some string-trickery, replacing all string literals with "quoted packed numbers"
    [Corion]: I fear this might be a bug in the RE engine, but if it is a bug, even fixing won't help me because I need Filter::Simple for Filter::signatures , which provides signatures as a backwards compatibility feature for Perl <5.22 - and these ...
    [Corion]: ... won't get a fix anyway ;) My plan B is to encode the string placeholders avoiding \r and \n

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