   we   -1    1-7 
 ,        (   
 ).  cut   -     ( -
).        
  66     .   1,  
    (.  ):

$ we -I letter.txt

351 letter.txt
$ we -1 letter.txt | cut -cl-7

'  351

     man-  cut  we.
        cut,    
  we,  we       ,   -
 .      we    :

$ we -I < letter.txt

351

      ,
:

$ numpages=$[ $(we -I < letter.txt)/66 + 1]

  let     
  ,       -
 . ,    :

$ let "=$ (we -1 < letter.txt)/66 + 1"

     ( ,   ,  ,  -
   )      -
 let.        let: 
    0,    let  1;   -
  0.

 let        :

$ let =5+3 =7+2
$ echo $a $

8 9

        -
     let,     $ ()   
      ($),    - ,
      .    -
  numpages     :

$ let numpages=numpages+l
$ let nunipages=$numpages+l

  

  IFS (Internal Field Separators    )
 ,       
,      TAB NEWLINE.      -

 9.  II: Bourne Again Shell                                            341