75 lines
2.2 KiB
Bash
Executable File
75 lines
2.2 KiB
Bash
Executable File
#!/bin/bash
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# Public Domain
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# (someone claimed the next lines would be useful for…
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# people. So here goes: © 2012 Stefan Breunig
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# stefan+measure-net-speed@mathphys.fsk.uni-heidelberg.de)
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# path to store the old results in
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path="/dev/shm/measure-net-speed"
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# grabbing data for each adapter.
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# You can find the paths to your adapters using
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# find /sys/devices -name statistics
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# If you have more (or less) than two adapters, simply adjust the script here
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# and in the next block.
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eth0="/sys/devices/pci0000:00/0000:00:19.0/net/eth0/statistics"
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wlan0="/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/wlan0/statistics"
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read eth0_rx < "${eth0}/rx_bytes"
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read eth0_tx < "${eth0}/tx_bytes"
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read wlan0_rx < "${wlan0}/rx_bytes"
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read wlan0_tx < "${wlan0}/tx_bytes"
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# get time and sum of rx/tx for combined display
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time=$(date +%s)
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rx=$(( $eth0_rx + $wlan0_rx ))
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tx=$(( $eth0_tx + $wlan0_tx ))
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# write current data if file does not exist. Do not exit, this will cause
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# problems if this file is sourced instead of executed as another process.
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if ! [[ -f "${path}" ]]; then
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echo "${time} ${rx} ${tx}" > "${path}"
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chmod 0666 "${path}"
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fi
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# read previous state and update data storage
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read old < "${path}"
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echo "${time} ${rx} ${tx}" > "${path}"
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# parse old data and calc time passed
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old=(${old//;/ })
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time_diff=$(( $time - ${old[0]} ))
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# sanity check: has a positive amount of time passed
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if [[ "${time_diff}" -gt 0 ]]; then
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# calc bytes transferred, and their rate in byte/s
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rx_diff=$(( $rx - ${old[1]} ))
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tx_diff=$(( $tx - ${old[2]} ))
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rx_rate=$(( $rx_diff / $time_diff ))
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tx_rate=$(( $tx_diff / $time_diff ))
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# shift by 10 bytes to get KiB/s. If the value is larger than
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# 1024^2 = 1048576, then display MiB/s instead (simply cut off
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# the last two digits of KiB/s). Since the values only give an
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# rough estimate anyway, this improper rounding is negligible.
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# incoming
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rx_kib=$(( $rx_rate >> 10 ))
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if [[ "$rx_rate" -gt 1048576 ]]; then
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echo -n "${rx_kib:0:-3}.${rx_kib: -3:-2} M↓"
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else
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echo -n "${rx_kib} K↓"
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fi
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echo -n " "
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# outgoing
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tx_kib=$(( $tx_rate >> 10 ))
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if [[ "$tx_rate" -gt 1048576 ]]; then
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echo -n "${tx_kib:0:-3}.${tx_kib: -3:-2} M↑"
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else
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echo -n "${tx_kib} K↑"
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fi
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else
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echo -n " ? "
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fi |