Import measure-net-speed bash scripts to contrib/

contrib/measure-net-speed-i3status.bash

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+#!/bin/bash
+# Public Domain
+# (someone claimed the next lines would be useful for…
+#  people. So here goes: © 2012 Stefan Breunig
+#  stefan+measure-net-speed@mathphys.fsk.uni-heidelberg.de)
+
+# append i3status output to the measure-net-speed’s one.
+# the quote and escape magic is required to get valid
+# JSON output, which is expected by i3bar (if you want
+# colors, that is. Otherwise plain text would be fine).
+# For colors, your i3status.conf should contain:
+# general {
+#   output_format = i3bar
+# }
+
+# i3 config looks like this:
+# bar {
+#   status_command measure-net-speed-i3status.bash
+# }
+
+i3status | (read line && echo $line && while :
+do
+  read line
+  dat=$(measure-net-speed.bash)
+  dat="[{ \"full_text\": \"${dat}\" },"
+  echo "${line/[/$dat}" || exit 1
+done)

contrib/measure-net-speed.bash

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+#!/bin/bash
+# Public Domain
+# (someone claimed the next lines would be useful for…
+#  people. So here goes: © 2012 Stefan Breunig
+#  stefan+measure-net-speed@mathphys.fsk.uni-heidelberg.de)
+
+
+# path to store the old results in
+path="/dev/shm/measure-net-speed"
+
+# grabbing data for each adapter. 
+# You can find the paths to your adapters using
+#  find /sys/devices -name statistics
+# If you have more (or less) than two adapters, simply adjust the script here
+# and in the next block. 
+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 / $time_diff ))
+
+  # shift by 10 bytes to get KiB/s. If the value is larger than
+  # 1024^2 = 1048576, then display MiB/s instead (simply cut off  
+  # the last two digits of KiB/s). Since the values only give an  
+  # rough estimate anyway, this improper rounding is negligible.
+
+  # incoming
+  rx_kib=$(( $rx_rate >> 10 ))
+  if [[ "$rx_rate" -gt 1048576 ]]; then
+    echo -n "${rx_kib:0:-3}.${rx_kib: -3:-2} M↓"
+  else
+    echo -n "${rx_kib} K↓"
+  fi
+
+  echo -n "  "
+
+  # outgoing
+  tx_kib=$(( $tx_rate >> 10 ))
+  if [[ "$tx_rate" -gt 1048576 ]]; then
+    echo -n "${tx_kib:0:-3}.${tx_kib: -3:-2} M↑"
+  else
+    echo -n "${tx_kib} K↑"
+  fi
+else
+  echo -n " ? "
+fi