Honestly, in my opinion not a lot, except many people have years of experience in unix shell, and many programs you will download will have unix shell scripts,

Honestly, in my opinion not a lot, except many people have years of experience in unix shell, and many programs you will download will have unix shell scripts, but not powershell. On the other hand, remember on the scale of computing, powershell is fairly recent. We used to have batch files and the 'cmd' shell, and they were fairly awful.