#include <stdio.h>
#include <unistd.h> 

int main()
{
        printf( "hello world\n" );
        int pid = fork();
        printf( "fork returned %d\n", pid );
        if ( pid == 0 )
                execl( "/bin/ls", "ls", NULL );
        else
                printf( "I'm the parent\n" );
}