Fix OS detection w/ 'uname' on non-Linux systems #65
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Commit ed8a3b6 broke OS detection on non-Linux OSes, because
$CYGWIN_NT
expands to nothing when the environment variableCYGWIN_NT
is undefined.What @DookTibs meant was just
"$sack__OS == "CYGWIN_NT"*
(no dollar sign). It still worked under Cygwin, but just by luck, because$sack__OS == *
. Addingset -u
/set -o nounset
at the top of the script would stop these kinds of errors from slipping through, but that's a problem for another day.This PR should fix that problem, and makes OS detection work again on (at least) macOS.