7 Linux commands for beginners

Print some text on terminal. This can be redirected to a file:

echo "Hello world!"
Print current date and time. Can be used also to set date and time:
date
Print the current username:
whoami
Show the information about the system - kernel in particular:
uname -a
Show the current name of target host:
hostname
Show tha last logins happened on target system:
last
Set the password for current user:
passwd