Summary of commands for controlling the process in Linux

What are the commands that control the process in Linux? Let's take a look

Operating system: Debian 8.5

Note: n below represents the serial number in jobs

1. Check what commands are running in the background in Linux: jobs

root@wing-01:~ # jobs
[1]+ Stopped     python backup_mysql.py wing 1.2.3.4 8888 wing
[2]- Running     python backup_mysql.py wing 1.2.3.5 8888 wing &
root@wing-01:~ #

2. Make the process run in the background: cmd &

root@wing-01:~ # python backup_mysql.py wing 1.2.3.5 8888 wing &
[2] 27716
root@wing-01:~ #

3. Make the background process n run to the foreground: fg %n

root@wing-01:~ # jobs
[1]+ Stopped     python backup_mysql.py wing 1.2.3.4 8888 wing
[2]- Running     python backup_mysql.py wing 1.2.3.5 8888 wing &
root@wing-01:~ # fg %2
python backup_mysql.py wing 1.2.3.5 8888 wing

4. Let the foreground n run in the background: bg %n

#  This command applies to passing ctrl-z Suspended process 
#  Such as the following job In the job1 Is through the ctrl-z Suspended, the program will no longer be occupied CPU , suspend the execution, can be passed top Look at its occupancy CPU At a rate of 0% At this point not only can it be passed fg %n Let its foreground continue to run, also can pass bg %n Let it run in the background 
root@wing-01:~ # jobs
[1]+ Stopped     python backup_mysql.py wing 1.2.3.4 8888 wing
[2]- Running     python backup_mysql.py wing 1.2.3.5 8888 wing &
root@wing-01:~ # bg %1
[1]+ python backup_mysql.py wing 1.2.3.4 8888 wing &
root@wing-01:~ #
#  And at that point you go through top, It's starting to take over CPU,CPU The utilization rate is not 0 , indicating that it is already running in the background. 

5. Suspend the current program: ctrl-z

At this point, the program is in a state where CPU does not apply to perform any tasks, that is, the program is in a state of suspension, waiting for it to be awakened with other commands.

root@wing-01:~ # python backup_mysql.py yumin 172.16.33.227 3333 yumin platform test
^Z
[1]+ Stopped     python backup_mysql.py yumin 172.16.33.227 3333 yumin platform test
root@wing-01:~ #

6. Suspend the program through PID: kill -STOP pid

root@wing-01:~ # kill -STOP 28021
[1]+ Stopped     python backup_mysql.py yumin 172.16.33.227 3333 yumin
root@wing-01:~ # 
#  Now you can go through top Look at its occupancy CPU At a rate of 0% , the process has stopped. 

7. Restore the program to the background operation through PID: kill -CONT pid

root@wing-01:~ # kill -CONT 28021
root@wing-01:~ #
#  And at that point you go through top, It's starting to take over CPU,CPU The utilization rate is not 0 , indicating that it is already running in the background. 

conclusion