#!/usr/bin/perl -w#!/usr/bin/perl -w
use strict;

# Simple script to identify file types and rename stuff accordingly
# Also my first script to use strict; ;D

my $bufferlength = 10;
my %signatures = (
  "zip" => "PK\x03\x04",
  "rar" => "Rar!",
  "mp3" => "\xFF[\xF0-\xFF]",
  "gz" => "\x1f\x8b\x08",
  "tar" => "\x66\x69\x78\x6e",
);

while (my $filename = shift) {
  open( FILE, "< $filename" ) or die "Can't open $filename : $!\n";
  binmode FILE; # just to be on the safe side
  my $read = read( FILE, my $buffer, $bufferlength ) or die "Can't rea
+d from $filename : $!\n";
  close FILE;
  # if the file was too small, skip it
  next if $read != $bufferlength;

  foreach (keys %signatures) {
    if ($buffer =~ /^$signatures{$_}/) {
      if ($filename !~ /$_$/i) {                                      
+                                  
        my $newname = $filename . "." . $_;
        print "$filename -> $newname\n";
        rename( $filename, $newname ) or die "Can't rename $filename t
+o $newname : $!\n"
      };
      last;
    };                                                                
+                            
  };
};

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In reply to File identifier by Corion

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