Any command entered in the COMMAND LINE disappears after the successful execution of its intended function.
If you want to repeat the same command , you got to re-type it or use some PF key to retrieve the last command entered.
But here is a cool method the make the command entered not to disappear and stay on the screen.
Precede commands with ‘&’
After the execution of the command, the below command stays on the screen. This way you can enter the same command or modifying the command a little and using it multiple times.