Like when you send a .7z instead of a .zip or .rar to a friend or a teacher because that’s what your computer has installed and they’re like “Oh No, not one of those, now I have to install 7Zip” even though the same program that opens .rar also opens .7z I feel like people are way more annoyed when they receive a .7z

    • rektdeckard@lemmy.world
      2·
      1 year ago

      Often used internally in software development to denote things like test files. feature.js might be your code, and feature.test.js would contain tests for that code which your testing framework would run automatically based on the filename.

      • leonardo_arachoo@lemm.ee
        1·
        1 year ago

        Oh yeah I think schemas for helm charts are another example.

        values.schema.json

        Why it’s not a yaml I’m not sure.

    • cadekat@pawb.social
      1·
      1 year ago

      It’s common when you “wrap” one file type inside another. Like .tar combines multiple files into one, then .gz compresses a single file.

      You also see it with PGP (encryption).

      • luciferofastora@discuss.online
        15·
        1 year ago

        Suppose I have a javascript file for a node server’s backend access named db.js

        Suppose I write tests for those functions and name the test script file db.test.js

        Suppose I tar and gzip that file (bear with me), now named db.test.js.tar.gz

        Suppose I sign that file with PGP, now named db.test.js.tar.gz.pgp

        Now suppose I want to hide that signed compressed tarball of a javascript tests file for my db functions, and to do so, I name it .db.test.js.tar.gz.pgp

        Now I have a file that looks like it consists of nothing but extensions. I’m sure you could push it even further though, if you tried.