Background: Background
front desk: Foreground

1. View the command in the backgroundjobs
2. Switch the command to the background

ctrl + z
bg %[number] ;Number is the serial number of this command in the current command, and the serial number starts from 1

3. Switch the background command to the front desk

fg %[number] ;Number is the serial number of the command in the background command

0100、

ctrl + c ;can terminate the running program