add a existing user to existing group

usermod, id, Command Line, Linux Ubuntu, 2015 1229


To add an existing user jerry to ftp supplementary/secondary group with usermod command using -a option ~ i.e. add the user to the supplemental group(s). Use only with -G option:

 
  usermod -a -G ftp jerry
  id jerry
 

To change existing jerry's primary group to www, enter:

 
  usermod -g www jerry