ss Linux command

The Linux ss command is a versatile tool for displaying socket statistics. It can provide information on network connections, routing tables, and interface statistics. With ss command, users can analyze network performance, troubleshoot connection issues, and monitor network activity in real-time.

Unlike the netstat command, ss command offers more detailed and up-to-date information about sockets. It is faster and more efficient, making it a preferred choice for system administrators and network engineers. By utilizing various options and filters, users can customize the output to meet their specific requirements.

With ss command, users can examine TCP, UDP, and RAW sockets, as well as Unix domain sockets. They can view socket states, timer information, and process information associated with sockets. This comprehensive tool allows for in-depth analysis of network connections and helps identify potential network problems.

Overall, the ss command is a valuable utility for managing network connections and diagnosing network issues on Linux systems. Whether you are a beginner or an experienced user, mastering the ss command can enhance your network troubleshooting skills and improve your overall system performance.

ss Syntax:

ss [options] [filters]

Options:

Option	Description
-h, —help	Display help information
-t, —tcp	Show TCP sockets
-u, —udp	Show UDP sockets
-l, —listening	Display only listening sockets
-a, —all	Display all sockets
-n, —numeric	Show numerical addresses
-p, —processes	Show process using the sockets
-o, —options	Display timer information
-m, —memory	Display socket memory usage
-s, —summary	Display summary statistics
-r, —resolve	Resolve IP addresses
-F, —family FAMILY	Show sockets of type FAMILY (inet, inet6, link, unix)

Parameters:

Parameter	Description
filters	Filter the output based on specific criteria such as state, user, port, etc.

Caution

Exercise caution when using the ss command as it provides detailed information about network sockets and processes. Make sure you have the necessary permissions to view this sensitive data.

ss bash Examples:

Display all TCP and UDP sockets

ss -a

Displays all TCP and UDP sockets.

Show listening TCP and UDP sockets

ss -l

Shows only listening TCP and UDP sockets.

Show all TCP sockets

ss -t

Shows all TCP sockets.

Show all UDP sockets

ss -u

Shows all UDP sockets.

Display network statistics

ss -s

Displays network statistics.

Show process information

ss -p

Shows process information for each socket connection.

Tip

When using the ss command in Linux, ensure you have the necessary permissions to view socket statistics, as some options may require root privileges.

How do I display all listening TCP ports using ss?

To display all listening TCP ports using ss, execute the following command:

ss -tln

How can I show all established connections with ss?

To show all established connections using ss, use the following command:

ss -t state established

How do I list all UDP sockets with ss in Linux?

To list all UDP sockets using ss in Linux, you can run the following command:

ss -uln

How can I display all sockets in numerical form with ss?

To display all sockets in numerical form using ss, use the following command:

ss -n

How do I filter ss output based on specific criteria?

To filter ss output based on specific criteria, you can use the following command:

ss state LISTEN sport = :22

How can I show detailed TCP socket information with ss?

To show detailed TCP socket information using ss, execute the following command:

ss -t -a

How do I monitor system socket statistics continuously with ss?

To monitor system socket statistics continuously using ss, run the following command:

watch -n 1 ss -s

How can I display summary statistics for different socket types with ss?

To display summary statistics for different socket types using ss, use the following command:

ss -s

Applications of the ss command

• Display detailed information about network connections
• Show socket statistics
• Monitor network bandwidth
• Filter and display specific types of connections
• Find the current state of network ports
• Troubleshoot network-related issues