usermod

Modify a user account. See also: users, useradd, userdel. More information: https://manned.org/usermod.

• Change a username:

sudo usermod {{-l|--login}} {{new_username}} {{username}}

• Change a user ID:

sudo usermod {{-u|--uid}} {{id}} {{username}}

• Change a user shell:

sudo usermod {{-s|--shell}} {{path/to/shell}} {{username}}

• Add a user to supplementary groups (mind the lack of whitespace):

sudo usermod {{-a|--append}} {{-G|--groups}} {{group1,group2,...}} {{username}}

• Change a user home directory:

sudo usermod {{-m|--move-home}} {{-d|--home}} {{path/to/new_home}} {{username}}