README clarification about cross-platform about xshell

[matklad]

That’s the right intuition! We don’t have sed, but we do have more basic stuff like cd, cp, rm, etc: https://docs.rs/xshell/0.1.17/xshell/#functions

Adding something like sed is totally in scope for xshell. Although in this specific case, I’d say that probably writing usual Rust code withregex would be ergonomic enough.

The bash is in quotes because, rather than providing a literal POSIX-compatible environment, we provide whatever is needed to get a similar feeling.

[hoijui]

oh wow.... OK! :-)
then.. all good I guess.. thank you!
and.. cool! :-)
..and indeed.. rust regex makes more sense then sed.