Linux Command - ss
ss - another utility to investigate sockets
ss is used to dump socket statistics.
Options
Syntax
1 | ss [options] [ FILTER ] |
When no option is used ss displays a list of open non-listening sockets (e.g. TCP/UNIX/UDP) that have established connection.
| option | description |
|---|---|
| -t, –tcp | Display TCP sockets. |
| -u, –udp | Display UDP sockets. |
| -l, –listening | Display only listening sockets (these are omitted by default). |
| -p, –processes | Show process using socket. |
| -n, –numeric | Do not try to resolve service names. Show exact bandwidth values, instead of human-readable. |
Examples
Display all TCP sockets.
1 | ss -t -a |
Finding the PID of the process using a specific port. Here we use a filter to filter by port number. You can then kill the process using kill command.
1 | ss -lpn 'sport = :8080' |