nethogs − Net top tool grouping bandwidth per process
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)]
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.
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-V |
prints version. | ||
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-h |
prints available commands usage. | ||
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-x |
bughunt mode - implies tracemode. | ||
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-d |
delay for update refresh rate in seconds. default is 1. | ||
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-v |
view mode (0 = KB/s, 1 = total KB, 2 = total B, 3 = total MB, 4 = MB/s, 5 = GB/s). default is 0. | ||
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-c |
number of updates. default is 0 (unlimited). | ||
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-t |
tracemode. | ||
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-p |
sniff in promiscuous mode (not recommended). | ||
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-s |
sort output by sent column. | ||
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-l |
display command line. | ||
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-a |
monitor all devices, even loopback/stopped ones. | ||
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-C |
capture TCP and UDP. | ||
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-b |
Display the program basename. | ||
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-g |
garbage collection period in number of refresh. default is 50. | ||
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-P |
Show only processes with the specified pid(s). | ||
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-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
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q |
quit | ||
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s |
sort by SENT traffic | ||
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r |
sort by RECEIVED traffic | ||
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l |
display command line | ||
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b |
display the program basename | ||
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m |
switch between total (KB, B, MB) and throughput (KB/s, MB/s, GB/s) mode |
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
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.
netstat(8) tcpdump(1) pcap(3)
Written by Arnout Engelen <[email protected]>.