,        disk   disc,
   disc   ,   spell_check   -
  disc  .   
,     .

18.   bundle (.  " Here") ,  -
          -
.          ,  
   ;     
   . , ,      . 
   srcshell,        testl.c 
test2. .        :

$ bash srcshell testl.c test2.

19.     ( ),   -
    /etc/passwd   ,    -
,         , -
    (:   gawk.)

20.       Inks (.  " Inks")?
?

 28.   Bourne Again Shell                                913