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Module: System
Function: getEnv
Type: String -> IO String
Description: Computation getEnv var returns the value of the environment variable var. If variable var is undefined, the isDoesNotExistError exception is raised.
Related:

Example 1

Input: getEnv "HOME"

Output: "/home/nicmila"

Example 2

Input: getEnv "XXX"

Output: File or variable not found: XXX