Uses of Cygwin

[Alvin Oo]

1) does it support ruby,python,c++,c, java?
2) What type of shell does it support? (sh,ksh),what can it emulate?
3) Is it possible for cygwin to start in a certain folder, akin to when I 
drop cmd.exe on a certain folder, or name powershell to start in a certain 
folder it will open up, i need to navigate to directory fast
4) What are the alternatives to cygwin, what are the advantage and 
disadvantage of cgywin?
5) What are the most common uses of cgywin?


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