 ,         -
 ,     .    -
   /bin  /usr/bin,    ,   
.            -
,   ,   ,    PATH, 
 ,      ( ) .

     ,      -
 PATH.       .  -
   PATH ,      
 /usr/local/bin.       ,  
 /bin,   /usr/bin.        ,  -
  /home/alex/bin , ,  .   
   .    (   -
   )   .    -
  (  ; .   ""), -
  (   )     
   .  ,      -
 (.).      PATH   .
      PATH   -
,          :

$ export PATH=/usr/local/bin:/bin:/usr/bin:/home/alex/bin:

  Linux         bin
("binary"  ),       -
    ~/bin.      bin   -
 PATH,     ,        , -
      ,   PATH .



PATH  .     ,    -
    PATH. ,     
    Is.        -
     Is,    ,    -
 Is,      .    
,          -
 PATH.          PATH
  .       ,  
   . /, , . /Is.

   PATH   ,      -
      .   -
    PATH  /usr/XHR6/bin    /usr/bin  :

$ PATH=/usr/XllR6/bin:$PATH:/usr/bin:

MAIL: ,   

 MAIL   ,      ( -
 ,   /var/spool/mail/,     ).

 MAILPATH   ,  .  
 ,         -

312                                       III,   Red Hat Linux