!!:s//    

       - . ,  
        ,   
     .   -  -
  ,          -
.     ,   
 :

$ car /home/jenny/memo.0507 /home/alex/letter.0507

bash: car: command not found     (  )

$ !!:s/car/cat

cat /home/jenny/memo.0507 /home/alex/letter.0507

""   

      . -
           .
     . ,  :

$ ^old^ew

   ,  

$ !!:s/old/new/

  cat  car        

$ ^ar^cat

cat /home/jenny/memo.0507 /home/alex/letter.0507

        ,     
 ,     .     ,  
   RETURN.         . 9.4.

 9.4.  
            

h                               .

 (root  )                 .

 (extension  )      ,    .

t (tall  )                     ,  .

 (print  )                 ,    .

[  ] s / //               
(substitute  )      ',      .1'

 s       .  
 s   (  gs/'/'/),     ,   
   .      ;   -
  ,     ,    .    -
,      RETURN.      Substitute  vi,
    (&)      .  -
    (s/ //)       , 
      ''7.

 9.  II: Bourne Again Shell                                            329