Those are just a few of the more common Linux commands that can be used on any terminal, or from the shell:

ls - lists the contents of the directory
cd - cd [name] - change current directory to 'name'
pwd - displays name of working directory
mkdir - mkdir [name] - creates new 'name' directory
rmdir - rmdir [name] - removes directory 'name'

clear - clears the terminal window
date - displays current date and time
uptime - displays time since last reboot
df - displays disk usage on partitions
du - displays disk usage of current directory

exit - exits the terminal
reboot - reboots the system
halt - shuts down the computer
startx - starts xwindows from terminal
su - allows you to login as Super User (Root)
top - displays cpu processes, memory, etc
ps - displays all current running processes

id - displays your identification to system
groups - displays groups of current user
ulimit -a - displays users limits
uname - displays name of machine logged into
who - displays 'who' is logged on the system

Want to add some more to this? There are so many more, and lots of variations (command line options) to the ones above...

To find some more, most commands can use the following line option:

[command] --help - shows help about the [command]

And this is it for now. Until next time!