According to http://ngwww.ucar.edu/ngdoc/ng/ref/ncl/functions/getenv.html,
"The getenv function returns either an empty string when the shell environment
variable does not exist, or the string value of the environment parameter
requested."
However, if I do a getenv on an undefined environment variable, I get a fatal
error:
fatal:getenv : (NDAYS) is not a defined environment parameter
Something of a curioisity.
-- Gary Strand Climate Change Research Section, NCAR (303) 497-1336 strandwg AT unknown
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