environ.c

/**
   @file      environ.c
   @author    Mitch Richling <http://www.mitchr.me/>
   @Copyright Copyright 1994 by Mitch Richling.  All rights reserved.
   @brief     How to use environ@EOL
   @Keywords  environment unix environ
   @Std       ISOC 
   
              This is an example program intended to illustrate how to
              use environ.  environ is actually an ISO C construct.
              Most UNIX systems allow a third parameter to main() that
              is a pointer to environ; however, the ISO C standard
              forbids this.  Thus, one really should simply use the
              global variable environ.

   @Tested    
              - Solaris 2.8 
              - MacOS X.2
              - Linux (RH 7.3)
*/

#include <stdio.h>              /* I/O lib         ISOC  */
#include <stdlib.h>             /* Standard Lib    ISOC  */

extern char **environ;

int main(int argc, char *argv[]);

int main(int argc, char *argv[]) {
  char **cp;
  printf("Environment:\n");
  for(cp=environ; *cp != NULL; cp++)
    printf("  %s\n", *cp);
  printf("\n");
  return 0;
} /* end func main */