Working With Linux Patch 10 Step Guide

What is Linux patch ?
Here is patch description from Linux Man pages.
       patch - apply a diff file to an original

SYNOPSIS
       patch [options] [originalfile [patchfile]]

       but usually just

       patch -pnum <patchfile

DESCRIPTION
       patch takes a patch file patchfile containing a difference listing produced by the diff program and applies those
       differences to one or more original files, producing patched versions. Normally the patched versions are put in
       place of the originals. Backups can be made; see the -b or --backup option. The names of the files to be patched
       are usually taken from the patch file, but if thereâs just one file to be patched it can specified on the command
       line as originalfile.

How Linux patch works?
Here is short explanation about How to use patches in linux.
Working with Patch 10 step Guide.

mkdir patch_test
cd patch_test/
mkdir old
cd old
create file1.txt and file2.txt
cd .. ; mkdir new
cp file.txt and file2.txt == Now change both or any files to create patch
cd .. ; ls // new and old dir here
diff -Naur old new > learn.patch ==Your patch is ready.
patch -p0 < learn.patch == apply patch to old folder; you should be above old dir

How to Reverse patch applied?
In order to reverse the patch applied run following command.
patch -p 1 -R < learn.patch

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