In Linux, how does one view the developed port ?, View development ports in linux

In Linux, how does one view the developed port ?, View development ports in linux

Introduction: on Linux servers, it is often necessary to check whether certain ports of the system are enabled normally, or to know which processes occupy specific port services. Therefore, this command is very common, this article describes common methods for these commands.

1. check whether a specific port is enabled or occupied

List all tcp connections in the listener status:

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Netstat-lntp

Command Parsing:

-L list all listening ports

-N: the address and port number are displayed in numbers. domain name resolution is not performed to speed up information display.

-P indicates the process that occupies the port number.

-T list TCP connections

-A lists all the current connections, tcp, udp, and all the connections of all sockets under the unix protocol.

-U: List udp connections

Example of whether to use domain name resolution for-n:

From the content display in, we can see that-n can control whether it is displayed as a domain name.

Lists All tcp ports in the listener status.

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Netstat-alt

Find the process of a specific port:

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Netstat-phosphatase | grep 8010

View the user name or user id:

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Netstat-altep

Lists the user IDs of tcp in the current process.

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Netstat-altne

Here, if you use the-n and-e options together, the attribute of the User column is the User ID, not the User name. You can use the-ep option to view both the process name and user name.

-S: list the statistical network information:

-R: List route information

-I prints the network interface information, and-e works with it to output more friendly information.

Output Network Interface Information:

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Netstat-ie

2. lsof command

Command Format: lsof-I: port_number

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Lsof-I: 8010

3. How to find help information

In linux, a powerful command man is provided to help us find the most comprehensive introduction information.

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Man netstat

4. Summary

Netstat is a very powerful command that provides the vast majority of required information. lsof is also a very useful tool, but in specific circumstances, lsof may not be able to find out, however, netstat can be queried.

We recommend that you use nestat to query ports first.