Date: displays the time and date of the current system
Cal: Display the calendar of the current month
Df: View the current free space of the disk drive
Free: display available memory
Exit: end the terminal session
Pwd: Display the current working directory
Ls: List the contents of any directory
Cd: Change the current working directory (absolute path and relative path)
Cd –: Change the working directory to the previous working directory
Cd~username: change the working directory to username's home directory
