C Tutorial/stdlib.h/getenv
getenv
Item Value Header file stdlib.h Declaration char *getenv(const char *name); Return environmental information by *name.
If a call is made to getenv() with an argument that does not match any of the environment data, a null pointer is returned.
#include <stdlib.h>
#include <stdio.h>
int main(void){
printf("Path %s",getenv("PATH"));
}