/usr/lib/s9fes/help/sys_getenv is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 | S9 EXT (sys:getenv string) ==> string | #f
Return the value of the environment variable STRING. If
the variable is undefined, return #F.
(sys:getenv "HOME") ==> "/u/home/nmh"
(sys:getenv "nonexistent") ==> #f
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