Answer:
The command is<em> gedit &</em>
Explanation:
The command <em>gedit</em> tells the <em>shell</em> (the program that takes keyboard commands and carries them to the operating system) to run <em>gedit</em> (a text editor) and the ampersand symbol (<em>&) </em>suspends (or makes the program run in the background).
This can be understood from a historical perspective. In the 1980s, most users have only a terminal and can run only a program at once. They could suspend the current program using C<em>trl-Z</em> (or run the program in the background), and do some other tasks in the while.
Later, to check which job (or process) was suspended, they wrote the command <em>jobs, </em>which<em> </em>tells the user that the suspended ones (or running in the background) were those jobs inside square brackets<em> </em>( [number-of-the-job] ), that is, the <em>jobnumber</em>, assigned to that command (in this case, the command would be <em>gedit, </em>although it was not available at that time since its initial release was in 1999).
Then, to run again that suspended <em>process</em>, they wrote the command <em>fg</em> (foreground) followed by (%) and the <em>jobnumber</em>, so they were able to continue with the suspended job (or running-in-the-background job).
This a legacy of Unix-like systems and it is still in use nowadays.
So, to run <em>gedit</em> in the foreground, or <em>run it again</em>, it suffices to write the command <em>fg</em> followed by % and the <em>jobnumber</em> that corresponds to the aforementioned program, that is, <em>gedit</em>.
By the way, you can suspend <em>gedit</em> using Ctrl-Z in the terminal and run it again following all the instructions aforementioned.