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nethogs - Man Page

Net top tool grouping bandwidth per process

Examples (TL;DR)

Synopsis

nethogs [-V] [-h] [-x] [-d seconds] [-v mode] [-c count] [-t] [-p] [-s] [-a] [-l] [-f filter] [-C] [-b] [-g period] [-P pid] [device(s)]

Description

NetHogs is a small 'net top' tool. Instead of breaking the traffic down per protocol or per subnet, like most such tools do, it groups bandwidth by process - and does not rely on a special kernel module to be loaded. So if there's suddenly a lot of network traffic, you can fire up NetHogs and immediately see which PID is causing this, and if it's some kind of spinning process, kill it.

Options

-V

prints version.

-h

prints available commands usage.

-x

bughunt mode - implies tracemode.

-d

delay for update refresh rate in seconds. default is 1.

-v

view mode (0 = KB/s, 1 = total KB, 2 = total B, 3 = total MB, 4 = MB/s, 5 = GB/s). default is 0.

-c

number of updates. default is 0 (unlimited).

-t

tracemode.

-p

sniff in promiscuous mode (not recommended).

-s

sort output by sent column.

-l

display command line.

-a

monitor all devices, even loopback/stopped ones.

-C

capture TCP and UDP.

-b

Display the program basename.

-g

garbage collection period in number of refresh. default is 50.

-P

Show only processes with the specified pid(s).

-f

EXPERIMENTAL: specify string pcap filter (like tcpdump). This may be removed or changed in a future version.

device(s) to monitor. default is all interfaces up and running excluding loopback

Interactive Control

q

quit

s

sort by SENT traffic

r

sort by RECEIVED traffic

l

display command line

b

display the program basename

m

switch between total (KB, B, MB) and throughput (KB/s, MB/s, GB/s) mode

Running Without Root

In order to be run by an unprivileged user, nethogs needs the cap_net_admin and cap_net_raw capabilities. These can be set on the executable by using the setcap(8) command, as follows:

sudo setcap "cap_net_admin,cap_net_raw+pe" /usr/local/sbin/nethogs

Notes

1. When using the -P <pid> option, in a case where a process exited (normally or abruptly), Nethogs does not track that it exited. So, the operating system might create  a new process (for another program) with the same pid. In this case, this new process will be shown by Nethogs.

See Also

netstat(8) tcpdump(1) pcap(3)

Author

Written by Arnout Engelen <arnouten@bzzt.net>.

Info

14 February 2004