{{keywords>wiki library source code example reference}}
====== getenv ======
<code c>
    #include <stdlib.h>
    char *getenv(const char *name);
</code>    

getenv matches the string pointed to by name\\

returns a pointer to the value in the environment, or NULL if there is no match.\\

===== getenv C Sourcecode Example =====    
<code c>
/* 
 * getenv example code
 * http://code-reference.com/c/stdlib.h/getenv
 */
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <stdlib.h>

int main ( void )
{
  char *env;
  env = getenv ("USER");
  if (env!=NULL) {
    printf ("Your Username is: %s\n", env);
  }
  return 0;
}
</code>

==== Output ====

    user@host:~$ ./getenv 
    Your Username is: code-reference.com