cat:   

 cat    .    -
   "catenate" (),      .
( . 7.8 ,    cat     .)

          cat,
   ,    .  . 5.1    
practice    cat.       Is  cat. -
 Is   , a cat   .

rm:  

 rm ("remove"  )  .  . 5.1   
practice   rm.      rm  Is  cat -
,   practice   .  Is    , a cat -
,      .   rm  .

    .   ,   -
   (),    ,  
   rm.    rm   -i, (.  2
  4)    ,     rm   -
       ("yes"  )  n ("no"  ).  Red Hat Linux 
 root  -i   :

$ rm -i toollist

rm: remove 'toollist'? 

:  rm     ,  
 (.  ""  9)       (.
 " "  6).

less   more:

   

   ,     ,  -
  less ()  more ().     -
      .   -
 ,      -
 (pager).    ,     
, , less      EOF (End Of File  
)    q,     , a more 
  .      h,   
   ,      . 
 less practice  more practice   cat  . 5.1  ,
   .       -
,   less /etc/termcap.   
  man-  less.

156  II.   Red Hat Linux