What Processes Are Listening On Your Ports?

Sun, 13 Apr 2014 22:18:21 +0000

lsof

On OS X you wanna use sudo lsof -nP -iTCP -sTCP:LISTEN. The output looks like this:

$ sudo lsof -nP -iTCP -sTCP:LISTEN
COMMAND     PID   USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
launchd       1   root   23u  IPv6 0xf01241af1b915325      0t0  TCP *:5900 (LISTEN)
launchd       1   root   24u  IPv4 0xf01241af1b91732d      0t0  TCP *:5900 (LISTEN)
launchd       1   root   28u  IPv6 0xf01241af1b914ee5      0t0  TCP [::1]:631 (LISTEN)
launchd       1   root   29u  IPv4 0xf01241af1b916b45      0t0  TCP 127.0.0.1:631 (LISTEN)
launchd       1   root   31u  IPv6 0xf01241af1b914aa5      0t0  TCP *:22 (LISTEN)
launchd       1   root   32u  IPv4 0xf01241af1b91f32d      0t0  TCP *:22 (LISTEN)
mtmfs        55   root    4u  IPv4 0xf01241af1b91eb45      0t0  TCP 127.0.0.1:49152 (LISTEN)
mtmfs        55   root    6u  IPv4 0xf01241af1d38cb45      0t0  TCP 127.0.0.1:49153 (LISTEN)
ssh       45193 username    5u  IPv6 0xf01241af1b9128a5      0t0  TCP [::1]:8000 (LISTEN)
ssh       45193 username    6u  IPv4 0xf01241af2405eb45      0t0  TCP 127.0.0.1:8000 (LISTEN)

netstat

On many types of Linux you can use lsof, but also sudo netstat -tulpn. The output looks like this:

Sort du intelligently

Tue, 22 Oct 2013 17:14:00 +0000

The du command is a nice tool for telling you the disk usage of your files:

$ du *
[...]
1928	system.log
136	system.log.0.bz2
112	system.log.1.bz2
0	uucp
552	vnetlib
[...]

I find that adding the -h flag (which produces more human-readable output) is often very helpful for me:

$ du -h *
[...]
964K	system.log
 68K	system.log.0.bz2
 56K	system.log.1.bz2
  0B	uucp
276K	vnetlib
[...]

Now if I could just sort that…

Linux on galvanist

What Processes Are Listening On Your Ports?

lsof

netstat

Sort du intelligently