shell/bandwidth_monitor at master · sangrealest/shell · GitHub

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#!/bin/bash
#
#Author：Shanker
 if [ $# -eq 1 ]
     then
         INTERFACE=$1
        SECS=`uptime | awk '{ if ($3 ~ /:/) { split($3,a,":"); print (a[1]*60+a[2])*60} else { split($3,b,":"); split($5,a,":"); print b[1]*86400+(a[1]*60+a[2])*60} }'`
        EXT_IN=`ifconfig $INTERFACE|grep -i 'RX BY'|awk -F: '{print $2}'|cut -d' ' -f1`
        EXT_OUT=`ifconfig $INTERFACE|grep -i 'RX BY'|awk -F: '{print $3}'|cut -d' ' -f1`
        echo " "
        echo "External interface bandwidth usage:"
        echo " uptime             " $(($SECS/86400)) "days"
        echo " ExtIf in total     " $(($EXT_IN/1000000000)) "GBytes"
        echo " ExtIf out total    " $(($EXT_OUT/1000000000)) "GBytes"
        echo " ExtIf in/day       " $(($EXT_IN*86400/$SECS/1000000)) "MBytes/day"
        echo " ExtIf out/day      " $(($EXT_OUT*86400/$SECS/1000000)) "MBytes/day"
        echo " ExtIf in/30day     " $(($EXT_IN*86400*30/$SECS/1000000000)) "GBytes/month"
        echo " ExtIf out/30day    " $(($EXT_OUT*86400*30/$SECS/1000000000)) "GBytes/month"
        echo " ExtIf in+out/30day " $((($EXT_OUT+$EXT_IN)*86400*30/$SECS/1000000000)) "GBytes/month"
        else
        echo "usage $0 iface"
        fi