Look up a variable value from the environment.
char * getenv (char * var);
Required Header |
<stdlib.h> |
Return Value
This function returns a pointer to the variables value. A null pointer value indicates the variable does not exist in the environment.
Parameters
var
The variable name
Remarks
The getenv function looks up the variable var and returns a pointer to its value in the environment. It is not safe to directly modify the returned value, instead use the _putenv function to change values.