Especially useful to me is `git bulk` to apply a command to all the git repos under the directory, and `git ignore "bin/"` to quickly add something to the `.gitignore` file.
I like these a lot! It seems like git-extras is pure bash allowing it to work out of the box without any dependencies but I would probably go mad if I had to implement¹ reading/writing git index² in bash.
¹ https://github.com/ahmetsait/toolgit/blob/58713ead5abc060510...
² https://git-scm.com/docs/index-format