#include        <stdio.h>
#include        <unistd.h>
#include        <fcntl.h>
#define    CMD   "who"
main ()
{ int fd, i=2,k=0, status;
        if ( fork ())
           { wait (&status) ;
             i--; k--;
             write(1, "exam1\n",6);
             printf("I=%d K= %d \n",i,k);
            }
        else {
           for ( k=1; k<=3; k++)
           { write(1, "exam2\n",6);
             i=k+i;
             printf("I=%d K=%d\n",i,k);
             if ((execlp ( CMD, CMD , 0)) == -1)
             write(1, "exam3\n",6);
             printf("I=%d K=%d\n",i,k);
            }
             }
       write( 1, "exam4\n",6);
       if ((execlp("ls","ls",0))== -1 )
       printf("I=%d K=%d\n",i,k);
       else {write ( 1, "exam5\n",6);}
}