diff --git a/safe_mv/safe_mv b/safe_mv/safe_mv
new file mode 100755
index 0000000..21ed553
--- /dev/null
+++ b/safe_mv/safe_mv
@@ -0,0 +1,78 @@
+#!/usr/bin/perl -w
+
+# $Id$
+# $Source$
+
+#
+# Scriptje om bestanden te moven, en bij het reeds bestaan van een bestand
+# op de plek waar het naartoe gemoved wordt eerst even te vergelijken 
+# of ze identiek zijn. Zo nee, gaat de move niet door. Zo ja, delete
+# te moven bestand.
+# (C) 2001 Ward Wouts
+#
+# Argumenten $source-bestanden $target-dir
+#
+
+use File::Copy;
+use Digest::MD5 qw(md5);
+
+$DEBUG = 0;
+
+if ($#ARGV < 1) { &help; }
+
+$targetdir=pop;
+if ( ! -d $targetdir ) { &help; }
+if ( $DEBUG ) { print "$targetdir\n"; }
+
+foreach ( @ARGV ) {
+	$source = "$_";
+	$target = "$_";
+	$target =~ s/.*\///;
+	$target = $targetdir."/".$target;
+	if ( -e "$target" ) {
+		&compare($source, $target);
+	} else {
+		if ( $DEBUG ) { print "mv $_ -> $target\n"; }
+		else { move("$_", "$target") or die "move failed: $!"; }
+	}
+}
+
+sub help {
+	print "Usage: $0 source_files target_dir\n";
+	exit 1;
+}
+
+sub compare($source, $target) {
+	my ($source_size, $target_size);
+	print "Comparing... ";
+# First compare size. If this differs, we're done quickly.
+	if ( (-s $source) == (-s $target) ) {
+		if ( $DEBUG ) { print "$source and $target are the same size\n"; }
+		$source_digest = &calc_md5($source);
+		if ( $DEBUG ) { print "source digest $source_digest\n"; }
+		$target_digest = &calc_md5($target);
+		if ( $DEBUG ) { print "source digest $target_digest\n"; }
+		if ( $source_digest eq $target_digest ) {
+			print "Files are the same. Deleting $source.\n";
+			unlink($source) 
+				or die "Can't delete $source: $!\n";
+		} else {
+			print "Skipped mv $source -> $target files differ\n"
+		}
+	} else {
+		print "Skipped mv $source -> $target files differ\n";
+	}
+}
+
+sub calc_md5($file) {
+	my ($file, $digest);
+	$file = shift;
+	$md5 = Digest::MD5->new;
+	open FILE, "<$file" or die "couldn't open file: $!\n";
+	seek(FILE, 0, 0);
+	$md5->reset;
+	$md5->addfile(FILE);
+	$digest = $md5->hexdigest;
+	close(FILE);
+	return $digest;
+}