diff --git a/files.pl b/files.pl
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+++ b/files.pl
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+#!/usr/bin/perl -w
+#
+# files.pl	Print file sizes in folded format, for a flame graph.
+#
+# This helps you understand storage consumed by a file system, by creating
+# a flame graph visualization of space consumed. This is basically a Perl
+# version of the "find" command, which emits in folded format for piping
+# into flamegraph.pl.
+#
+# Copyright (c) 2017 Brendan Gregg.
+# Licensed under the Apache License, Version 2.0 (the "License")
+#
+# 03-Feb-2017   Brendan Gregg   Created this.
+
+use strict;
+use File::Find;
+
+sub usage {
+	print STDERR "USAGE: $0 directory\n";
+	print STDERR "   eg, $0 /Users\n";
+	print STDERR "Intended to be piped to flamegraph.pl. Full example:\n";
+	print STDERR "   $0 /Users | flamegraph.pl " .
+	    "--hash --countname=bytes > files.svg\n";
+	exit 1;
+}
+
+usage() if @ARGV == 0 or $ARGV[0] eq "--help" or $ARGV[0] eq "-h";
+
+my $dir = $ARGV[0];
+
+find(\&wanted, $dir);
+
+sub wanted {
+	my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size) = stat($_);
+	my $path = $File::Find::name;
+	$path =~ tr/\//;/;		# delimiter
+	$path =~ tr/;.a-zA-Z0-9/_/c;	# ditch whitespace and other chars
+	$path =~ s/^;//;
+	print "$path $size\n";
+}