Create the group with:
   
      groupadd 
managers
   
  Add david to the new group with:
   
      usermod -G managers 
  david
   
  The "-G" is the option to add supplemental groups to a user.  Note 
  that "david" is still in his original "david" group (and that is his PRIMARY 
  group).
   
  Check the /etc/passwd and /etc/group files to make sure that it did 
  what you want.
   
  Charlie
  
    
    i'm stuck with usermod and groupmod.  if 
    you have a user set up and want to change the group that they belong 
    to?
     
    First you would create the group.  That 
    has been done checked /etc/group file and the group is there.  "All 
    from root".  Let's say the user is david and his current group is 
    david.  I create a group called mangers.  To change david to the 
    group mangers would it be usermod -G david,mangers does not seem to work or 
    groupmod -g david,mangers also does not seem to work.  I'm lost as to 
    how to do this 
     
    Help