Looks really nice from first glance, would need to give it a try for a week or so to see how it really fits in my workflow.

>In daily life I need work linux shell and got the understanding that this kind of library can be applied in shell as well. S

Then why not sticking to unix command names? For example my most used command on linux is "ls", which in nixar is "fs" for some reason. Am I missing something?

I would try to get it to be as close to unix commands as possible, if you really hoping to achieve linux shell feel. And it would be really easy to jump from linux machine to it.

What would be nixar's selling point? Why would users choose it instead of cygwin or minGW?