  Red Hat .bash_profile     -/.bashrc.
  .bash_profile     ( vi,  
  ),   stty    
         -
  .

   .bash_profile,   vtlOO   <CONTROL+H>
   :

$ cat .bash_profile

. export IERM=vtlOO
stty erase '^h'

     " "  9.

-/.bashrc.      
,      .    -
         
  ,   () .  .bashrc   .bash profile
,        ,     -
   .      "-
 "  9.

/dev/null.  ,    , ;   
   (bit bucket).  /dev/null     
     mknod.  ,   -
   ,    .    
      nothing:

$ cat /dev/null > nothing



$  /dev/null nothing

,    /dev/null,
$ > nothing

           -
,    .     -
         .   /dev/null
      :

$ grep portable * 2>/dev/null

      portable      -
.  ,     (.  "-
  "  9),       
 , ,   ,   
,   .

/dev/pts.    /dev/pts    
  Linux     . 
       ssh, telnet  xterm  
   .    -
  ,     

 12. ,                                     447