getenv[procedure] getenv string
ChezScheme, Chicken, STk, Scsh, Bigloo:
returns the environment value or #f.
See also setenv!, setenv or putenv.
This is called lookup-environment-variable or sys-getenv
on some implementations.
[procedure] getenv [string]
STklos: the environment name is optional. If omitted,
returns an alist of all environment names and variables.
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