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Showing content from https://en.wikibooks.org/wiki/C++_Programming/Code/Standard_C_Library/Functions/getenv below:

C++ Programming/Code/Standard C Library/Functions/getenv - Wikibooks, open books for an open world

getenv[edit | edit source] Syntax
#include <cstdlib>
char *getenv( const char *name );

The function getenv() returns environmental information associated with name, and is very implementation dependent. NULL is returned if no information about name is available.

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