/*/////////////////////////////////////////////////////////
// demo executable
//
// Takes a list of environment variable names as
// command-line arguments, and prints them with
// their values to a file named "env-vars" in the
// current directory.
//
// Example code by Albert L. Rossi, IU Extreme! Computing
// December 2001
/////////////////////////////////////////////////////////*/

#include <stdlib.h>
#include <stdio.h>

int
main (int argc, char **argv)
{
  FILE *list;
  char *value;
  char nd [10];
  int i;
  
  if ((list = fopen("env-vars", "w")) == NULL) {
    fprintf(stderr, "could not open env-vars\n");
    return -1;
  }

  sprintf(nd, "%s", "Undefined");

  for (i = 1; i < argc; i++) 
  {
    if ((value = getenv(argv[i])) == NULL) value = nd;
    fprintf(list, "%s:\t%s\n", argv[i], value);
  }
  
  fclose(list);
  return 0;
}