Cheap iftop

watch 'netstat -anptu |egrep "^Proto|:80 "'

Shows updated status in a terminal window for connections to port '80' in a human-friendly form. Use 'watch -n1' to update every second, and 'watch -d' to highlight changes between updates. If you wish for status updates on a port other than '80', always remember to put a space afterwards so that ":80" will not match ":8080".

Sample Output

Every 2.0s: netstat -anptu |egrep "^Proto|:80 "                            Wed May 18 11:03:25 2011

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     18418/apache
tcp        0      0 64.xxx.183.xxx:80        213.xxx.243.xxx:21370  SYN_RECV   -
tcp        0      0 64.xxx.183.xxx:80        213.xxx.243.xxx:6465   SYN_RECV   -
tcp        0      0 64.xxx.202.xxx:80        213.xxx.243.xxx:30703  SYN_RECV   -
tcp        0      0 64.xxx.202.xxx:80        64.xxx.202.xxx:39600   TIME_WAIT  -
tcp        0      0 64.xxx.202.xxx:80        64.xxx.202.xxx:39601   TIME_WAIT  -

By: Mozai

2011-05-18 15:05:52

egrep watch monitoring netstat watch

1 Alternatives + Submit Alt

Polls fos network port usage
This is sample output - yours may be different.
-4

while sleep 1; do date; (netstat -a -n | grep 80) ; done

hute37 · 2011-05-16 07:56:56 6

What Others Think

nice but won't tell me which vhost the connection went to or to which hosted site. any chance to see this info too?

Ovidiu · 695 weeks and 6 days ago

watch -dn2 'netstat -anptu | egrep "^Proto|:80" | sort' will watch on ports 80 and 8080 and sort output if u have a lot of connections, highliting changes with update interval 2 sec.

ilrandir · 695 weeks and 4 days ago

Ovidiu: When you say vhost, do you mean a protocol thing, like the domain part of the "RCPT TO:" lines of SMTP? In that case, you'll need packet inspection -- you're better off doing a 'tail -f logfile |grep ' instead.

Mozai · 694 weeks and 6 days ago

ilrandir : I already mentioned using other values for "-n" in the comment.

Mozai · 694 weeks and 6 days ago

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What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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