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History

Toor 4bde1486f8 Adding a lot more examples		6 years ago
..
Makefile	Adding a lot more examples	6 years ago
README.md	Adding a lot more examples	6 years ago
cello-output-first.patch	Adding a lot more examples	6 years ago
cello.c	Adding a lot more examples	6 years ago
cello.c.orig	Adding a lot more examples	6 years ago

README.md

Patching

A patch is a source code that updates other source code. It is formatted as a diff, because it represents what is different between two versions of text. You create a diff with thie diff utility, which is then applied to the source code using the patch utility.

NOTE: Other version control systems like git provide their own methods of creating diffs or patching software.

This is an example where we are creating a patch from the original source code using diff and then applying it via patch.

Patching in 6 easy-ish steps

Preserve the original source code

cp cello.c cello.c.orig

Change the source code

Generate a patch using the diff utility

diff -Naur cello.c.orig cello.c

Save the patch to a file

diff -Naur cello.c.orig cello.c > cello-output-first-patch.patch

Restore the original file

cp cello.c.orig cello.c

Patch the original with the contents of the new patch file using the patch utility

patch < cello-output-first.patch