Switch back and forth commands in Linux: Ctrl+z,bg,fg,jobs

I want to switch to the background to run some services:

Two methods:

1. You can add a character & to the last face of the start Service command at runtime, for example./servicestart &

2. After the service starts, press CTRL + Z to switch the service to the background and pause, then use the command: BG number starts the service in the background and can use jobs to view the tasks in the background after startup.

Note: number is the job ID, after pressing CTRL + Z, the terminal will display the service's job number, for example, I press CTRL + Z

^z
[1]+ Stopped./servicestart
So the job number is 1.

Second, want to switch the service running in the background to the foreground, enter the command: FG number

For example: BG 1

Switch back and forth commands in Linux: Ctrl+z,bg,fg,jobs