I can confirm it also works Linux. I just installed `git-extras` via `Homebrew` on my Ubuntu machine:
```sh
$ uname -srv
Linux 5.8.0-53-generic #60~20.04.1-Ubuntu SMP Thu May 6 09:52:46 UTC 2021
$ brew install git-extras
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 2 taps (homebrew/cask and homebrew/core).
==> New Formulae
code-minimap principalmapper pywhat
==> Updated Formulae
Updated 70 formulae.
==> Updated Casks
Updated 36 casks.
==> Downloading https://ghcr.io/v2/linuxbrew/core/git-extras/manifests/6.2.0
######################################################################## 100.0%
==> Downloading https://ghcr.io/v2/linuxbrew/core/git-extras/blobs/sha256:5a86
==> Downloading from https://pkg-containers.githubusercontent.com/ghcr1/blobs/
######################################################################## 100.0%
==> Pouring git-extras--6.2.0.x86_64_linux.bottle.tar.gz
==> Caveats
To load Zsh completions, add the following to your .zshrc:
source /home/linuxbrew/.linuxbrew/opt/git-extras/share/git-extras/git-extras-completion.zsh
==> Summary
🍺 /home/linuxbrew/.linuxbrew/Cellar/git-extras/6.2.0: 146 files, 388.4KB
```
User visible:
* Also accept the git install path (and not the mingw64 subdir) as a user
supplied install location. Make it the new default and warn the user if
a mingw64 dir is supplied (=this dir is not checked, so it might be
anywhere...)
* Find git.exe in path and use that as an install location
* Add error|status messages and output less noise (robocopy)
* do some check if column.exe is not found...
* adjust the installation text for windows...
not user visible:
* more.exe does not work when used in a cmd which has a unicode codepage
-> save the current codepage and set a sane default during the install
* do some "magic" with quotes around path variables -> makes it work with
pathes with spaces in it (both final git dir and the git-extra checkout)
* Do not leak variables to the sourounding interpreter
