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#!/bin/bash
# Source: http://www.onlamp.com/pub/a/linux/2000/11/16/LinuxAdmin.html
INSTANCE="${BLOCK_INSTANCE}"
if [[ "${INSTANCE}" = "" ]]; then
INSTANCE="wlp3s0;both"
fi
DISPLAY=$(echo "${INSTANCE}" | awk -F ';' '{print $2}')
INSTANCE=$(echo "${INSTANCE}" | awk -F ';' '{print $1}')
if [[ "${DISPLAY}" = "" ]]; then
DISPLAY="both"
fi
ONE_KB=1024
ONE_MB=$(echo "${ONE_KB}*1024" | bc -l)
TEN_MB=$(echo "${ONE_MB}*10" | bc -l)
OHD_MB=$(echo "${TEN_MB}*10" | bc -l)
URGENT_VALUE="${ONE_MB}"
PREV_IN=0
PREV_OUT=0
PREV_FILE="/tmp/.bandwidth"
if [[ -f "${PREV_FILE}" ]]; then
PREV_CONT=$(cat "${PREV_FILE}")
PREV_IN=$(echo "${PREV_CONT}" | head -n 1)
PREV_OUT=$(echo "${PREV_CONT}" | tail -n 1)
fi
BANDWIDTH=$(grep "${INSTANCE}" /proc/net/dev | awk -F: '{print $2}' | awk '{print $1" "$9}')
if [[ "${BANDWIDTH}" = "" ]]; then
exit
fi
BYTES_IN=$(echo "${BANDWIDTH}" | awk -F ' ' '{print $1}')
BYTES_OUT=$(echo "${BANDWIDTH}" | awk -F ' ' '{print $2}')
function FormatNumber() {
if [[ "${1}" -ge "${OHD_MB}" ]]; then
echo $(echo "scale=0;${1}/${ONE_MB}" | bc -l)"mb"
elif [[ "${1}" -ge "${TEN_MB}" ]]; then
echo $(echo "scale=1;${1}/${ONE_MB}" | bc -l)"mb"
elif [[ "${1}" -ge "${ONE_MB}" ]]; then
echo $(echo "scale=2;${1}/${ONE_MB}" | bc -l)"mb"
elif [[ "${1}" -ge "${ONE_KB}" ]]; then
echo $(echo "scale=0;${1}/${ONE_KB}" | bc -l)"kb"
else
echo "${1}""b"
fi
}
if [[ "${PREV_IN}" != "" ]] && [[ "${PREV_OUT}" != "" ]]; then
# Calculate the CPU usage since we last checked.
DIFF_IN=$(echo "scale=0;${BYTES_IN} - ${PREV_IN}" | bc -l)
DIFF_OUT=$(echo "scale=0;${BYTES_OUT} - ${PREV_OUT}" | bc -l)
DIFF_TOTAL=0
USAGE_IN=$(FormatNumber "${DIFF_IN}")
USAGE_OUT=$(FormatNumber "${DIFF_OUT}")
if [[ "${DISPLAY}" = "both" ]]; then
echo "${USAGE_IN} : ${USAGE_OUT}"
echo "${USAGE_IN} : ${USAGE_OUT}"
echo ""
DIFF_TOTAL=$((DIFF_TOTAL+DIFF_IN))
DIFF_TOTAL=$((DIFF_TOTAL+DIFF_OUT))
elif [[ "${DISPLAY}" = "in" ]]; then
echo "${USAGE_IN}"
echo "${USAGE_IN}"
echo ""
DIFF_TOTAL=$((DIFF_TOTAL+DIFF_IN))
elif [[ "${DISPLAY}" = "out" ]]; then
echo "${USAGE_OUT}"
echo "${USAGE_OUT}"
echo ""
DIFF_TOTAL=$((DIFF_TOTAL+DIFF_OUT))
fi
else
echo "?"
echo "?"
echo ""
fi
# Remember the total and idle CPU times for the next check.
echo "${BYTES_IN}" > "${PREV_FILE}"
echo "${BYTES_OUT}" >> "${PREV_FILE}"
if [[ "${DIFF_TOTAL}" -ge "${URGENT_VALUE}" ]]; then
exit 33
fi
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