PowerShell and bash have programming languages that are, although both very good at what they do, based on totally disparate philosophies. An example that perhaps best underlines this difference is ...

The open-source push appears to be helping PowerShell become more popular among developers, showing up for the first time in 45th place in Tiobe's most popular programming languages.

Linux usage of PowerShell is the key reason Microsoft's programming language for the first time this March reached 45 in Tiobe's programming-language popularity index.