I think it's simply related to the fact that the Mac OS has become more popular, not necessarily the command line.
Only a correlation. Regular users generally don't use the command line.
Only a correlation. Regular users generally don't use the command line.
I can certainly see some environments in which you might never be exposed, in things like Visual Studio, XCode, or Eclipse.
My recollection is that Windows has never really had a good native shell, but I've not used win7 for any length of time, and I'm not sure if Powershell ever became a thing. There's also cygwin, but I'm pretty sure that'll be more remote still.
I have a suspicion that the reason Github appears so mac-dominated is because of the pain of dealing with git under windows, especially when tortoise-git wasn't around/stable. Then again, there always seemed to be a heavy rails/OSX connection, but I don't know exactly where that comes from.
Add to that inconsistencies in how commands handled spaces in names and issues with having to escape the '\'s in generated command lines. I know I would have avoided all of it if I wasn't being paid (well) to do it.