Process Management 2

Process Management--Terminate process

1. Kill command

[[Email protected] ~] #kill-L

#查看可用的进程信号

Signal Code	Signal Name	Description
1	SIGHUP	This signal enables the process to shut down immediately and then restarts after the configuration file is read again.
9	SIGFPE	Used to immediately end the operation of the program, this signal can not be blocked, processed and ignored. Typically used to force a process to terminate.
15	SIGTERM	The signal of the normal end process, the default signal of the KILL command. Sometimes if the process has been a problem, this signal is unable to terminate the process normally, we will try to sigkill signal, that is, signal 9.

1 is actually restarting the service, and service Apache Restart actually calls the 1 signal;

9 for Force termination 15 is normal termination

Example: [[email protected] ~] #kill-1 22354

#重启进程

[[Email protected] ~] #kill-9 22368

#强制杀死进程

Example: [Email protected] ~]$ pstree-p |grep httpd

|-HTTPD (1065)-+-httpd (2285)

| |-HTTPD (2286)

| |-HTTPD (2287)

| |-HTTPD (2288)

| |-HTTPD (2289)

[[email protected] ~]$ sudo kill-9 2287 forced removal process

[Email protected] ~]$ pstree-p |grep httpd

|-HTTPD (1065)-+-httpd (2285)

| |-HTTPD (2286)

| |-HTTPD (2288)

| |-HTTPD (2289)

| '-httpd (5498)

[[email protected] ~]$ sudo kill-1 1065 Restart main process

[Email protected] ~]$ pstree-p |grep httpd

|-HTTPD (1065)-+-httpd (5686)

| |-HTTPD (5687)

| |-HTTPD (5688)

| |-HTTPD (5689)

| '-httpd (5690)

2. Killall command

[[Email protected] ~] $killall [options] [signal] Process name

#按照进程名杀死进程

Options:

-I: Interactive, asking if you want to kill a process

-I ignores process name capitalization

Example: [[email protected] ~]$ sudo killall-9 httpd

[Email protected] ~]$ pstree-p |grep httpd

3. Pkill command

[[email protected] ~]$ pkill [options] [signal] Process name

#按进程名终止进程

Options:

-T terminal number: Kick the user according to the terminal number

Example: [[email protected] ~]$ sudo service httpd start

#启动httpd服务

[Email protected] ~]$ pstree-p |grep httpd

|-HTTPD (5826)-+-httpd (5827)

| |-HTTPD (5828)

| |-HTTPD (5829)

| |-HTTPD (5830)

| '-httpd (5831)

#查看httpd服务的进程

[email protected] ~]$ sudo pkill-9 httpd

#终止httpd服务进程

[Email protected] ~]$ pstree-p |grep httpd

#查看httpd的进程树, the discovery has been terminated.

a forced termination is a condition in which the normal stop means does not take effect. Under normal circumstances, starting the HTTPD service is still required to start This command with service httpd.

Example: [[email protected] ~]$ W #查看当前登录的用户数

17:41:01 up 2:34, 2 users, load average:0.00, 0.01, 0.05

USER TTY from [email protected] IDLE jcpu PCPU

Xiaofeng tty1 15:36 2:03m 0.15s 0.15s-bash

Xiaofeng pts/0 192.168.217.1 15:07 5.00s 0.25s 0.00s W

[[email protected] ~]$ sudo pkill-9-T tty1 kick the local login account

[Email protected] ~]$ W

17:41:54 up 2:35, 1 user, load average:0.00, 0.01, 0.05

USER TTY from [email protected] IDLE jcpu PCPU

Xiaofeng pts/0 192.168.217.1 15:07 2.00s 0.26s 0.00s W

#查看当前用户, found that Tty1 was kicked out

Process Management 2