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read the transcript!
panel 1
two stick figures talking. the first one is bald and looks unhappy. the second one has short curly hair and is smiling.
person 1: I can’t start my server because it says something is using port 8080!
person 2:
- Use ss (“socket statistics”) to find the process ID using the port
- Kill the other process!
* tuna, please! *
$ ss -tunapl
(the ‘a’ here doesn’t do anything)
This is my favourite way to use ss! It shows all the running servers.
-n
use numeric ports (80 not http)
-P
show PIDs using the socket
TONS of information
-i -m -o
(-i is in a spiky bubble, -m is in a cloud bubble, and -o is in a heart)
which sockets ss shows
listening or connections (non-listening/established)?
default: connections
-1: listening
-a: both
which protocols?
default: all
-t: TCP
-u: UDP
-X: unix domain Sockets
netstat
netstat -tunapl and ss -tunap! do the same thing
netstat is older and more complicated. If you’re learning now I’d recommend ss!