To apply a patch to a single file, do that in it's directory:
		$ patch < foo.patch
	
		Assuming that the patch is distributed in unified format identifying
		the file the patch should be applied to, the above will work. Otherwise:
		$ patch foo.txt < bar.patch
	
		You can apply a patch to an entire directory, but note the "p level".
		What this means is that inside patch files will be the files that you
		intend to patch, identified by path names that might be different
		when the files ane located on your own computer instead of on the computer
		where the patch was created. 'p' level instructs the 'patch' utility to
		ignore parts of the path name to identify the files correctly. Usually a
		p level of 1 will work, so you would use:
		$ patch -p1 < baz.patch
	
		Change to the top level directory before running this. If a patch level
		of 1 cannot identify the files to patch, then inspect the patch file for file names.
		For example:
		/home/user/do/not/panic/yet.c
	
		and you are working in a directory that contains panic/yet.c, use:
		$ patch -p5 < baz.patch
	
You usually count one up for each path separator (forward slash) removed from the beginning of the path, until you are left with a path that exists in the current working directory. The count is the p level.
		Removing a patch using the -R flag
		$ patch -p5 -R < baz.patch
	
		Diff can create a patch for a single file:
		$ diff -u original.c new.c > original.patch
	
		For diff'ing a source tree:
		$ cp -R original new
	
		Do whatever you want in new/ and then diff it:
		$ diff -rupN original/ new/ > original.patch
	
git is something special.
		Just make whatever changes you want to a git clone and then:
		$ git diff > patch.git
	
		Note the git revision that you did this with:
		$ git log
	
it really is.
		Now to apply that patch in the future, just git clone it again and do
		with the git revision you found from above:
		$ git reset --hard REVISIONNUMBER
	
		Now put patch.git in the git clone directory and do:
		$ git apply patch.git
	
		Copyright © 2014 Francis Rowe <info@gluglug.org.uk>
		This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions.
		A copy of the license can be found at ../license.txt.
	
This document is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See ../license.txt for more information.