$ mkdir d
	$ cd d

	$ mkdir sub
	$ echo 1 > f
	$ echo 2 > f.new
	$ diff -Nu f f.new > f.diff
	$ mv f.new f
	$ echo 3 > f.new
	$ diff -Nu f f.new >> f.diff
	$ rm f.new
	$ echo 1 > f
	$ chmod a=r f
	$ strace -o ../log patch -p0 --backup < f.diff
	> patching file f
	> patching file f

	$ cd ..
	$ rm -rf d