A brief analysis of checking port occupancy and killing in Wind and Linux (with code)

In the previous article "An article explaining common terminal commands in MacOS (with code)", we learned about an article explaining common terminal commands in MacOS. The following article will teach you how to check port occupancy and kill in Wind and Linux. Let's see how to do it.

Port occupancy and Kill(Window & Linux)

Windows use

window The netstat

• -a displays all connecting and listening ports.

• -n Display the address and port number in numerical form.

• #-o Displays the owned process ID associated with each connection.

View all port occupancy

netstat  -ano

View the PID corresponding to the occupied port 3306

netstat -ano | findstr 3306

View the PID process of the specified port 3306

tasklist | findstr 3306

End the process

Force (/F parameter) to kill all processes with a pid of 12345, including Child process (/T parameter):

taskkill /T /F /PID 12345

LinuxUse

Use netstatcommand

-t (tcp)Display only tcp related options

-u (ucp)Display only ucp related options -nRefuse to display aliases, convert all numbers that can be displayed into numbers

-l Only list those in Listen(listening) Service status

-p Display the name of the program that establishes the relevant link

See all currently used ports

netstat   -nultp

Check the usage of a certain port

netstat   -anp |grep 3306

Use the lsof command

• Default : No options, lsof lists all open files of active processes

• Combinations: Options can be combined together, such as -abc, But be careful which options require arguments

• ##-a : the result is ANDed (not ORed)

• -l : Display userID in output instead of username

• -h : Get help

• -t : Get only the processID

• -U : Get the UNIX socket address

• -F : Format the output result for other commands. Can be formatted in many ways, such as -F pcfn (for process id, command name, file descriptor, file name, and terminated with null)

lsof -i:3306

Commonly used

• ##lsof abc.txt

  Display the open file abc.txt Process

• lsof -i :22

  Know what program is running on port22

• lsof -c abc

  Display the files currently opened by the abc process

• lsof -g gid

  Display ownership gid Process status

##lsof d /usr/local/
• Display the files opened by the process in the directory

lsof D /usr/local/
• Same as above, but the directory under the directory will be searched, which takes a longer time

lsof -d 4
• Display Use

  fd as the process of 4

lsof -i
• to display the process status that meets the conditions

lsof -p 12
• See which files are opened by the process with process number

  12

lsof |-r [t]
• Control

  lsof to be executed repeatedly, the default is 15srefresh

lsof -r, lsof
• will continue to execute forever until an interrupt signal is received

lsof r, lsof
• will continue to execute until no files are displayed

lsof -s
• List the size of open files, if there is no size, leave blank

lsof -u username
• List open files with

  UID

  ##Use
ps

command

Command parameters:

a

Display all processes

• -a
Display the same All programs under the terminal

• -A
Display all processes

• c
Display the real name of the process

• -N
Reverse selection

• ##-e

  is equal to "
-A
• ”

  e

  Display environment variables

• f

  Display the relationship between programs

• -H

  Display the tree structure

• r

  Display the processes of the current terminal

• T

  Display all programs of the current terminal

• u

  All processes of the specified user

• -au

  Show more detailed information

• -aux

  Show all trips that include other users

• -C 列出指定命令的状况

• --lines 每页显示的行数

• --width 每页显示的字符数

• --help 显示帮助信息

• --version 显示版本显示

查找特定进程

ps -ef|grep ssh

输出：

chuchur@linux:~/share$ ps -ef|grep bash
chuchur        9448  79650  0 06:05 pts/4    00:00:00 grep --color=auto bash
chuchur       79650  79575  0 03:49 pts/4    00:00:00 bash

通过服务名字查找PID

查找 nginx 和 python 占用情况

ps aux | egrep '(nginx|python)'

输出：

root         951  0.0  0.3 425268 27680 ?        Ssl   2020   9:48 /usr/libexec/platform-python -Es /usr/sbin/tuned -l -P
root      212828  0.0  0.1 135300 13924 ?        Ss    2020   0:00 nginx: master process /usr/sbin/nginx
root     2488443  0.0  0.1 164676 14892 ?        S    Mar06   0:00 nginx: worker process

结束进程

kill命令参数

• -1 (HUP)：重新加载进程。

• -9 (KILL)：杀死一个进程。

• -15 (TERM)：正常停止一个进程。

• -KILL 强制杀死进程

kill -9 65300 #彻底干掉pid为65530的进程

kill -9 $(ps -ef | grep guest) #干掉guest 用户进程
#or
kill -u guest

推荐学习：windows教程

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