Usually running the command with an ampersand:
appended will do it.
ls -al &
For more intricate work, the application "screen" may be of more use
Screen is mentioned in many posts of this type, and also has a very useful (if complicated) manpage. The server may or may not have that application installed. If you don't have root access, contact someone who does to install it for you, or try installing it within your home/bin.