Hi,
the attached bash script calculates the transfer rate in a time
interval. While it works if called manually, the intended use is in
addition to i3status.
The script is very simple and only displays the combined rate for all
given adapters, but adjusting it to show every adapter should be simple
enough. That being said, to get the script running you likely need to
adjust the paths to your computer (find /sys -name "statistics" works
nicely).
Have a look at i3status’ man page on how to combine the output. While it
should be possible to source the script, i3bar crashes for me (reported
the bug already). Running the script in a subshell and having a single
echo like written in the man page works, though.
License is WTFPL.
--Stefan
#!/bin/bash
# path to store the old results in
path="/dev/shm/measure-net-speed"
# grabbing data
eth0="/sys/devices/pci0000:00/0000:00:19.0/net/eth0/statistics"
wlan0="/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlan0/statistics"
read eth0_rx < "${eth0}/rx_bytes"
read eth0_tx < "${eth0}/tx_bytes"
read wlan0_rx < "${wlan0}/rx_bytes"
read wlan0_tx < "${wlan0}/tx_bytes"
# get time and sum of rx/tx for combined display
time=$(date +%s)
rx=$(( $eth0_rx + $wlan0_rx ))
tx=$(( $eth0_tx + $wlan0_tx ))
# write current data if file does not exist. Do not exit, this will cause
# problems if this file is sourced instead of executed as another process.
if ! [[ -f "${path}" ]]; then
echo "${time} ${rx} ${tx}" > "${path}"
chmod 0666 "${path}"
fi
# read previous state and update data storage
read old < "${path}"
echo "${time} ${rx} ${tx}" > "${path}"
# parse old data and calc time passed
old=(${old//;/ })
time_diff=$(( $time - ${old[0]} ))
# sanity check: has a positive amount of time passed
if [[ "${time_diff}" -gt 0 ]]; then
# calc bytes transferred, and their rate in byte/s
rx_diff=$(( $rx - ${old[1]} ))
tx_diff=$(( $tx - ${old[2]} ))
rx_rate=$(( $rx_diff / $time_diff ))
tx_rate=$(( $tx_diff / $time_diff ))
# shift by 10 bytes to get KiB/s and by 20 for MiB/s
# and print the more human readable value.
# 1024^2 = 1048576
# incoming
if [[ "$rx_mib" -gt 1048576 ]]; then
rx_mib=$(( $rx_rate >> 20 ))
echo -n "${rx_mib} M↓"
else
rx_kib=$(( $rx_rate >> 10 ))
echo -n "${rx_kib} K↓"
fi
echo -n " "
# outgoing
if [[ "$tx_mib" -gt 1048576 ]]; then
tx_mib=$(( $tx_rate >> 20 ))
echo -n "${tx_mib} M↑"
else
tx_kib=$(( $tx_rate >> 10 ))
echo -n "${tx_kib} K↑"
fi
else
echo -n " ? "
fi