Linux netstat

安装

root@aade5ae73079:/var/www/html# apt -y install net-tools
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
  net-tools
0 upgraded, 1 newly installed, 0 to remove and 50 not upgraded.
Need to get 250 kB of archives.
After this operation, 1015 kB of additional disk space will be used.
Get:1 http://deb.debian.org/debian bullseye/main amd64 net-tools amd64 1.60+git20181103.0eebece-1 [250 kB]
Fetched 250 kB in 3s (99.0 kB/s)                             
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package net-tools.
(Reading database ... 19912 files and directories currently installed.)
Preparing to unpack .../net-tools_1.60+git20181103.0eebece-1_amd64.deb ...
Unpacking net-tools (1.60+git20181103.0eebece-1) ...
Setting up net-tools (1.60+git20181103.0eebece-1) ...

查看端口占用

[root@iZ8vbcjkeqbrdmmbt23vboZ ~]# netstat -nlp|grep -P ":80\b"
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      13690/docker-proxy

netstat

• -n, --numeric            don't resolve names
• -l, --listening          display listening server sockets
• -p, --programs           display PID/Program name for sockets
• -a, --all                display all sockets (default: connected)

grep

• -P, --perl-regexp         PATTERN is a Perl regular expression

正则表达式中的 “\b”匹配一个单词边界，也就是指单词和空格间的位置。例如， 'er\b' 可以匹配"never" 中的 'er'，但不能匹配 "verb" 中的 'er'。