POSIX commands are available on *nix platforms and PowerShell provides native functions or POSIX wrappers for most tasks. About the biggest issue is speed, but there's always POSIX or .NET Core in the rare instance tons of performance is required.
If I may, PS is a first-class citizen on Linux, macOS, and Windows. PowerShell is a spectacular cross-platform shell that provides an object oriented paradigm and it's available today.
If I may, PS is a first-class citizen on Linux, macOS, and Windows. PowerShell is a spectacular cross-platform shell that provides an object oriented paradigm and it's available today.