Creating and applying a patch with diff and patch

Hi,

this post describes to save and apply changes to an source file.

Let us assume you want to alter the file src/tuwien/auto/calimero/server/Launcher.java and from the changes you want to create a patch.

First make a copy of the origin file.

michael@debdev ~# cp src/tuwien/auto/calimero/server/Launcher.java src/tuwien/auto/calimero/server/Launcher.java.org

Then make some changes to the file and create the patch. Note the options -Nar also work for directories recursive. For a single file -u3 is sufficient.

michael@debdev ~# vi src/tuwien/auto/calimero/server/Launcher.java
michael@debdev ~# diff -Nar -u3 src/tuwien/auto/calimero/server/Launcher.java.org src/tuwien/auto/calimero/server/Launcher.java > myPatch.txt

Restore the origin file and apply the patch

michael@debdev ~# patch src/tuwien/auto/calimero/server/Launcher.java < myPatch.txt

Michael

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