Non-root User logged in
[student@desktop]~$

Root User logged in
[student@desktop]~#

Example command

usermod -L John

command => usermod
option => -L
argument => John


Si no se sabe usar el comando usar
man command
command --help | less

Formato (conventions) para leer man y help más facilmente

Ejemplo:
[student@desktop]~$ date --help
date [OPTION]... [+FORMAT]