Run process in background on Linux
Introduction
Linux is a powerful operating system that provides users with a wide range of features and capabilities. One of the most useful features of Linux is the ability to run processes in the background, allowing users to continue working on other tasks without interruption. In this blog post, we will explore how to run a process in the background in Linux.
Simple background process
command &
e.g.
top &
use jobs to see background PID
[1] 14814
Switch between foreground and background
Ctrl - Z
Process suspended, and return to the terminal
Check background process
jobs
Switch to background process
fg <job No.>
Let background process run in the background
bg <job No.>
Stop background process
kill %<job No.>
Run a background process and keep it running after logout
For example, a program that continuously outputs test.sh, as follows
while :
do
echo hello
sleep 1
done
hope to continue to execute after closing the terminal
nohup ./test.sh &
The default program output is in the nohup.out file
Exit the terminal and log in again to check the process
ps aux | grep test.sh
kill the process, use kill + process number
using screen
yum install screen
apt install screen
Input screen, enter a new virtual terminal, and execute the task.
Detach the current screen
<Ctrl> + <A>, <D>
See all background terminals
screen -list
Resume the last closed terminal
screen -r
Conclusion
Running a process in the background is a useful feature that can help you multitask more efficiently on your Linux system. In this blog post, we explored three different methods for running processes in the background: using the & operator, using the nohup command, and using the screen command. With these methods, you can run processes in the background and continue working on other tasks without interruption.