CALL GetEnv(Name, Value)
CHARACTER; scalar; INTENT(IN).
CHARACTER; scalar; INTENT(OUT).
Sets Value to the value of environment variable given by the
value of Name (
$name in shell terms) or to blanks if
$name has not been set.
A null character (`CHAR(0)') marks the end of
the name in Name—otherwise,
trailing blanks in Name are ignored.