Create a patch file

How to create your own patch files.

Creating a patch
For a directory of files:

diff -Naur olddir newdir > new-patch

or for a single file:

diff -Naur oldfile newfile >new-patch

Applying a patch

patch -p0 < /path/to/new-patch
patch -p1 < /path/to/new-patch

Which one of the above patch commands you use depends on your current working directory.
The -p option will optionally strip off directory levels from the patchfile. For Ex: if you have a patchfile with a header as such:

--- old/modules/pcitable        Mon Sep 27 11:03:56 1999
+++ new/modules/pcitable        Tue Dec 19 20:05:41 2000

Using a -p0 will expect, from your current working directory, to find a subdirectory called "new", then "modules" below that, then the "pcitable" file below that.

Using a -p1 will strip off the 1st level from the path and will expect to find (from your current working directory) a directory called "modules", then a file called "pcitable". Patch will ignore the "new" directory mentioned in the header of the patchfile.

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