The scripts have to be in your `PATH` and be executable from wherever you're running `git`. Say you have a script named `git-foo`. At the shell prompt, all of

The scripts have to be in your `PATH` and be executable from wherever you're running `git`. Say you have a script named `git-foo`. At the shell prompt, all of these should work: $ which git-foo $ git-foo $ git foo If the first or second commands fail, then `git-foo` is not in your PATH or is not executable. If those both work but the third command fails, I have no explanation. Here's the code which runs commands: https://github.com/git/git/blob/2996f11c1d11ab68823f0939b6469dedc2b9ab90/exec-cmd.c#L310-L327 https://github.com/git/git/blob/2996f11c1d11ab68823f0939b646... It basically prefixes your `PATH` (or a suitable default if `PATH` isn't set) with `GIT_EXEC_PATH` (defaulting to a compiled in value if not set) and then uses the normal Unix execvp machinery to run the command. You can try: $ GIT_TRACE=1 git foo But I'm not sure that will tell you anything helpful.