Some Linux commands can be issue by using just the Linux command line itself (e.g. '''pwd''', '''date''', '''ls''', '''cal'''), but some Linux commands may allow arguments that the command needs to perform specific operations.<br><br>

<span style="color:blue;font-weight:bold">command argument1 argument2 ... </span>

With the Linux OS containing over 2500 commands and utilities, it is good for a Linux user or sysadmin to learn about how to use commands “on-the-fly”.