getenv

Arguments

Returns

A string containing the value of the given environment variable, or nil if the environment variable is not defined.

Description

This function retrieves the value of an environment variable from the current process's environment. The environment variable must have been set or defined previously by a call to setenv.

Example

    Gamma> setenv("high", "40");
    t
    Gamma> getenv("high");
    "40"
    Gamma> low = 20;
    20
    Gamma> getenv("low");
    nil
    Gamma> 
    		

See the Start a Process section of the Common Functions for Any Program chapter (Tutorial Two) in the Cogent Tools Demo and Tutorials book for an example of this function used in context.

See Also

setenv