     (  /home),  
         :

# useradd -g 500 - "Alex Watson" alex

     /etc/login.defs    
  .    useradd    -
      /etc/skel,    
bash    .      
    man- useradd  usermod.  -
        passwd.

userdel:  
 

 ,    ,  , -
   .  userdel    . -
     ,       :

# userdel -r alex

        
     usermod.    
alex   ,          (31
 2003 ):

# usemod -e "12/31/03" alex

groupadd:  

 ,   useradd     , 
groupadd   ,     /etc/group.   -
      rtfm:

# groupadd -g 1024 rtfm

   -g,   ,   
   ,  500.  - 
    ,       -
    .

 userdel     groupdel,   
  .        
 groupmod,     :

# groupmod -g 1025 rtfm

# groupmod -n manuals rtfm

      rtfn    -
 .     rtfm   manuals.

    .     
groupmod      /etc/passwd.   
  /etc/passwd    .    
        .    -
          .

544  IV.  