From Cppreference
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const char *getenv( const char *env_var );
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Searches for an environmental variable with name env_var in the host-specified environment list and returns information associated with it. The set of environmental variables and methods of altering it are implementation-defined.
[edit] Parameters
env_var
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null-terminated character string identifying the name of the environmental variable to look for
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[edit] Return value
character string identifying the value of the environmental variable or NULL if such variable is not found.
[edit] Example