GENDIFF(1)

🦋 GENDIFF(1) — the girlies' guide to error-free diff file generation 💅

okay so bestie, welcome to gendiff(1) from the General Commands Manual section. this is the tool that makes diff files without you losing your entire mind, no cap ✨

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✨ NAME ✨

gendiff — Utility to aid in error-free diff file generation 🎀

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🌸 SYNOPSIS 🌸

gendiff DIRECTORY DIFF-EXTENSION

that's it. two little arguments. two. i promise you can do this 🫶

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💖 DESCRIPTION 💖

so gendiff is a tool for generating a diff file from a single directory. the generated diff can be applied with the patch(1) program to recreate the changes. iconic behaviour honestly 🔥

here's the tea: gendiff looks for any files with DIFF-EXTENSION as their extension in the specified DIRECTORY, and runs diff(1) on the files with DIFF-EXTENSION and the counterpart without it, in that order. order matters bestie, don't come for me 🙈

the way that this is SO much better than raw diff(1): it lets you generate diffs from source code without making a full copy of the directory, which you'd otherwise need when using the diff(1) utility directly. no duplicating gigabytes of files. we love a resource-conscious queen 👑

and for the packaging girlies: gendiff is commonly used to creating patches for the purposes of packaging software with rpmbuild(1). if you build RPMs, this is your moment. main character energy fr fr ⭐

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🧚 ARGUMENTS 🧚

• DIRECTORY — the directory to generate a diff from. that's the whole vibe check.
• DIFF-EXTENSION — the diff extension to look for. yes, extension. yes, it matters.

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🌈 EXIT STATUS 🌈

on success, 0 is returned. a nonzero failure code otherwise. classic. no notes 💀

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🍓 EXAMPLES 🍓

okay let's walk through this together, bestie. picture it:

assuming you need to modify a source file called somefile.cpp and have chosen the extension fix, copy it to somefile.cpp.fix before editing it. then edit the original file (somefile.cpp).

⚠️ the copy happens FIRST, the editing happens SECOND. do not switch those. that's literally the whole point of error-free generation, bestie 😭

after editing all the files you need to edit in this fashion, enter the directory one level above where the source code resides, and run gendiff on it:

gendiff myproject-1.0 .fix > myproject-1.0-fix.patch

look at that redirect doing its thing. slay 💅✨

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👑 SEE ALSO 👑

diff(1), patch(1)

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and that's the whole page bestie!! this served RPM 6.1.0 energy and was dated 2026-08-20, so you know it's fresh 🫶✨ go forth and generate diffs, you absolute icon 💜