How to view and close background running programs in Linux

1. Run the .sh file

You can run it directly using the ./sh file, but if you want to run it in the background even if you close the current terminal, you need the nohup command and the & command.

(1) & Command

Function: Add to the end of a command to execute the command in the background

(2) nohup command

Function: Run commands without interruption

2. View the commands currently running in the background

There are two commands available, jobs and ps. The difference is that jobs is used to view the tasks running in the background of the current terminal, which cannot be seen if the terminal is changed. The ps command is used to view the dynamics of the instantaneous process and can see the background processes running in other terminals.

(1) jobs command

Function: View the tasks running in the background of the current terminal

The jobs -l option can display the PID of all tasks in the current terminal. The status of jobs can be running, stopped, or Terminated. The + sign indicates the current task, and the - sign indicates the next task.

(2) ps command

Function: View all current processes

ps -aux | grep "test.sh" #a: Display all programs u: Display in user-based format x: Display all programs, regardless of terminal

3. Close the command currently running in the background

kill command: end the process

(1) Check jobnum through the jobs command, and then execute kill %jobnum

(2) Use the ps command to view the process ID PID, and then execute kill %PID

If it is a foreground process, just execute Ctrl+c to terminate it.

4. Switching and control of foreground and background processes

(1) fg command

Function: Move the command in the background to the foreground to continue running

If there are multiple commands in the background, you can first use jobs to view jobnum, and then use fg %jobnum to call out the selected command.

(2) Ctrl + z command

Function: Put a command being executed in the foreground into the background and put it in a paused state

(3) bg command

Function: Turn a command that is paused in the background into one that continues to execute in the background

If there are multiple commands in the background, you can first use jobs to view jobnum, and then use bg %jobnum to call out the selected command for continued execution.

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