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Creating a patch file


The diff command is used for creating a patch file.


For this you will have an Original file, Modified file and finally we will create a Patch file with these 2 files.

Diff command to create a patch file.

# diff -u original.txt updated.txt > patch.txt

Here -u represents the unified file.

Now applying the patch by the below command.

# patch original.txt < patch.txt

This will replace the original file with the modifications.

For Undo / Reverse the applied patch.

# patch -R original.txt < patch.txt

This will undo all the patches first applied.


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