#6. Process Management for Linux

A process is an entity that a program runs, and a child process (thread) under a process.Process StatisticsTo start the process statistics, you must first prepare the Accton recorded files

2. touch /var/log/pacct #创建记录所用的文件
4. accton /var/log/pacct #激活accton
6. accton #关闭accton
8. lastcomm -f /var/log/pacct #查看进程统计记录的文件

The background runs a task that takes a long time to run, put it in the background to run it so that you can enter a command to run after using the shortcut key CTRL + Z use jobs to view the background process queue and put the background suspended process back into the foreground executionFG 1
To view the currently running process, you can use PS aux to view the status of the process

2. [[email protected] ~]$ ps
4. PID TTY TIME CMD
6. 2064 pts/200:00:00 bash
8. 2122 pts/200:00:00 ping
10. 2123 pts/200:00:00 ps

Process State tree

2. [[email protected] ~]$ pstree
4. init─┬─NetworkManager
6. ├─abrtd
8. ├─acpid
10. ├─atd
12. ├─auditd───{auditd}
14. ├─automount───4*[{automount}]
16. ├─certmonger
18. ├─crond
20. ├─cupsd
22. ├─dbus-daemon───{dbus-daemon}
24. ├─hald─┬─hald-runner─┬─hald-addon-acpi
26. ││└─hald-addon-inpu
28. │└─{hald}
30. ├─master─┬─pickup
32. │└─qmgr
34. ├─6*[mingetty]
36. ├─modem-manager
38. ├─ntpd
40. ├─2*[ping]
42. ├─rhsmcertd
44. ├─rpc.statd
46. ├─rpcbind
48. ├─rsyslogd───3*[{rsyslogd}]
50. ├─sshd───sshd───sshd───bash─┬─ping
52. │└─pstree
54. ├─udevd───2*[udevd]
56. └─wpa_supplicant

Shows that the difference between PS and top is that top can dynamically show the progress of the processKill Process

2. kill 进程号
4. #如终止后台的ping进程
6. [[email protected] ~]$ ps
8. PID TTY TIME CMD
10. 2064 pts/200:00:00 bash
12. 2122 pts/200:00:00 ping
14. 2168 pts/200:00:00 ps
16. [[email protected] ~]$ kill 2122

Kill the foreground process using CTRL + C to find the process

1. pgrep -l sshd #查询ssh的进程

From for notes (Wiz)

#6. Process Management for Linux