str-var = Get_ENVVAR$(env-var-str)
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Operands:
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env-var-str
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the name of the environment variable for which the data is to be returned.
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Returns:
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Returns the string value for the specified var-name. If an unknown variable name is specified, a "" (a zero-length string) will be returned.
If a valid env-var-str, RC will be 0 and Msg$ will be "" (Null)
If an invalid env-var-str, RC will be 8, and Msg$ will contain an error message
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Special Notes:
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For example, Get_ENVVAR$("COMSPEC") would return the name of the system's command processor (Typically C:\Windows\System32\Cmd.EXE)
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