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CommentsA recent Cygwin upgrade left me ripping my hair out, because none of my npm or grunt commands would work. They spat out the error
Unknown system errno 203Helpful, right?
The fix
In your Cygwin
~/.bash_profilefile (create it andchmod 755 .bash_profileif it doesn't exist):export TMP=/tmp export TEMP=$TMPThis did the trick for me. Special thanks to this github comment.