Patch

A patch is a modification to vanilla NetHack not created by the DevTeam. Hundreds of patches can be found at the NetHack Patch Database (link). Historically, a small handful of popular patches have been incorporated into official releases.

If you want to know how to patch your NetHack sources, see the article on patching.

patch is also a program that can apply specially formed patch (also known as "diff" after the program that creates them) files. The usual invocation of patch is along the lines of

patch -p1 < patch_file

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