  :

$ echo 'xxxxxx CONTROL-U'
$ echo 'xxxxxx CONTROL-V CONTROL-U'

 

    Linux   ,     -
  ,     .   
Linux          
  ,        .  
        ;  
   .       
 GUI-,      GUI-.

       (directory). -
   ,    .    , 
   Windows,    GUI Linux,    ,  -
  :    ,    .

        .    
   ,    .   
  ,    :  , 
  ,     .

Is:   

    (  )    
    practice.   ,   ,
         Is ("list"  ).
   . 5.1   Is,    practice.
(    ,     -
 .)    . 5.1    
  .    .

$ Is

practice

$ cat practice

  , 
   .
$ rm practice
$ Is

$ cat practice

cat: practice: No such file or directory
(    !
$

. 5.1.   Is, cat  rm   practice

 5.  Linux 155