Windows shell annoyances, comparing MinGW and Cygwin

[gusl]

* using the default PATH, Rscript is not accessible, even though (due to brokenness). This goes for both shells.

* I cannot set PATH inside a script, forcing me to set it by hand. (both shells)

* after setting the PATH to point only to R/bin, Rscript works on Cygwin (but 'ls' doesn't!), but not on MinGW.

* MinGW cannot run inside Emacs. But I can run SSH from MinGW.

* I can use Cygwin inside Emacs (but only if I didn't start an R process). However, I cannot run SSH.

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UPDATE: I create a symbolic link, Rscript.lnk, and added it to C:/cygwin/bin (a.k.a. /usr/bin)
Now I can run Rscript from anywhere.