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Watch RX/TX rate of an interface in kb/s

Terminal - Watch RX/TX rate of an interface in kb/s
while [ /bin/true ]; do OLD=$NEW; NEW=`cat /proc/net/dev | grep eth0 | tr -s ' ' | cut -d' ' -f "3 11"`; echo $NEW $OLD | awk '{printf("\rin: % 9.2g\t\tout: % 9.2g", ($1-$3)/1024, ($2-$4)/1024)}'; sleep 1; done
2011-03-22 10:02:23
User: hons
Functions: awk cut echo grep sleep tr
15
Watch RX/TX rate of an interface in kb/s

Just a simple way without the need of additional tools. Of course, replace eth0 with your IF.

Alternatives

There are 2 alternatives - vote for the best!

Terminal - Alternatives
while cat /proc/net/dev; do sleep 1; done | awk '/eth0/ {o1=n1; o2=n2; n1=$2; n2=$10; printf "in: %9.2f\t\tout: %9.2f\r", (n1-o1)/1024, (n2-o2)/1024}'
while :; do OLD=$NEW; NEW=`cat /proc/net/dev | grep eth0 | tr -s ' ' | cut -d' ' -f "3 11"`; echo $NEW $OLD | awk '{printf("\rin: % 9.2g\t\tout: % 9.2g", ($1-$3)/1024, ($2-$4)/1024)}'; sleep 1; done

Know a better way?

If you can do better, submit your command here.

What others think

doesn't work well with longer interface names (like tunnel-xxx). doesn't work well if your byte counter is too long, and there is no space between : (after interface name) and the counter itself.

Comment by depesz 298 weeks and 3 days ago

This is great, I get the same result with GNOME system monitor. They must do it the same way.

Comment by fossilet 298 weeks ago

Nice one, but doesn't work with non-linux systems.

On OS X/Darwin, you can use netstat as a byte counter.

Guess it should also work on other BSD systems.

while :; do OLD=$NEW; NEW=$(netstat -I en0 -b | awk 'END { print $7, $10; }'); echo $NEW $OLD | awk '{printf("\rin: % 9.2g\t\tout:

% 9.2g", ($1-$3)/1024, ($2-$4)/1024)}'; sleep 1; done

Comment by bugmenot 297 weeks and 6 days ago

Your point of view

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