1	#include	<unistd.h>
     2	#include	<stdio.h>
     3	#include	<stdlib.h>
     4	main()
     5	{	int result;
     6		char prog[100];
     7	
     8		printf( "\nWelcome to the Dshell...\n" );
     9		printf( "Running as real UID %d and effective UID %d\n\n",getuid(),geteuid());
    10		while (1)
    11		{
    12			printf("What executable should the child run? ");
    13			scanf( "%s", &prog);
    14			result = fork();
    15			if ( result == 0 ) 
    16			  { execl(prog,prog,NULL);
    17			    exit(0); }
    18			else
    19			  { wait(NULL);
    20		 	    printf("\n...done waiting. Welcome back!\n----------\n\n"); }
    21		}
    22	}
    23