Environment Variables

Function: getenv variable-name

This function returns the value (a string) of the environment variable called variable-name. If the specified variable doesn't exist nil is returned.

(getenv "OSTYPE")
    => "Linux"

Function: setenv variable-name new-value

This function sets the value of the environment variable called variable-name to new-value. new-value can either be a string containing the new contents of the variable or nil, in which case the environment variable is deleted.

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