Ubuntu Users and Groups

I found these commands very useful when adding users and group via the command line.

If you want to add a new user to the system. This is a standard user
adduser username

Add existing user tony 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 -aG www-data tony

Change existing user tony primary group to www:
usermod -g www tony

UPDATED
Adding a group is done similarly with this command
addgroup groupname

Add user to group can also be done like this
adduser username groupname

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