Nineth Day Process Management & Task Scheduler

To view system process commands:

1. Utility Command PS-EF View all background processes generally use the filtering process with grep

2.ps-fu root View all root processes

PID Process number PPID The parent process number TTY process related terminal

2.top command Continuous monitoring process

physical memory is not enough to see Swap: Swap space size

in the The Top command presses M or P to see the processes that consume the most memory and cups

Pstree View process relationship Pstree can also add a parent process number jobs View background jobs

kill process : Kill

General use Kill plus process number

Kill-l shows all kill methods -9 and so on .

Killall a process with the same name kills

Pkill-9-U Oracle kills all Oracle processes

BG will suspend a command in the background and change to continue execution

FG moves commands in the background to the foreground to continue running

Ctrl + z can put a command that is being executed in the foreground into the background and pause

Task Scheduler

Cron : The corresponding configuration file /etc/crontab is the maintenance work of the system background

Service cron start view

use the crontab command to implement a user's own task plan

Crontab-e Edit

Crontab-l to list content in user Crontab

Cat/var/log/cron

Nineth Day Process Management & Task Scheduler