How to create new user in linux from command line

Command:

sudo useradd -m -s /usr/bin/fish -G Docker jhon

the -m parameter creates the user's home directory

the -s /usr/bin/fish parameter sets the login shell of the new account to fish shell, by default to bash.

the -G Docker parameter add the user to the Docker group, (useful to run docker commands without sudo)

and the last parameter jhon is the name of the user to create.