From what I've read, Git seems to rely heavily on POSIX-specific features, causing compatibility problems on Windows. However, I don't understand specifically what POSIX features Git uses which cannot be replicated easily on Windows.
Because of this issue, I've been very hesitant to start working with Git on my Windows computer. What POSIX features does Git use, and is this still an issue? How have projects like msysGit managed to circumvent these problems?
Yes, Git does rely on a POSIX system, but be advised that POSIX specifies a lot of things: a shell environment (i.e. command line environment), operating system interfaces (i.e. libraries that implement file I/O, threading, etc.), regular expressions, directory structure (i.e. /dev/null, /tmp), and utilities.
Given how I've defined POSIX, it should follow that Git relies on practically all of POSIX. However, if you read the Git developers' CodingGuidelines, you'll see that Git uses POSIX as a means of implementing wide portability.
msysGit gets around the compatibility problems because it is a POSIX environment.
Running Git on Windows generally means running on top of a POSIX run-time environment. This is the basis for Git for Windows. You first start Git BASH, and in that environment you run Git commands.
I can assure you that Git works fine in this manner!
If POSIX and the command line make you hesitant, you may want to explore Git UIs like Atlassian SourceTree or GitHub for Windows.
来源：https://stackoverflow.com/questions/22166612/is-gits-reliance-on-posix-features-still-an-issue-on-windows