calculator the RT from netty log, use bash

rt.sh

!/bin/bash
# ******************************************
#
# A function which calculator the Rt of log
#
# ******************************************

function getEpochMillionSecond
{
   ret=$(date +%s%N  -d "$1" | cut -b -13)
   eval $2=$ret
}

function map_put
{
  eval map_$1=$2
}

function map_get
{
  eval $2=\$map_$1
}

function map_remove
{
  eval $2=\$map_$1
  eval unset map_$1
}

while read line
do
   dv=$(echo "$line" | awk -F[][] '{print $3}')
   c=$(echo "$line" |awk -F[][] '{print $4}' | awk -F[:,] '{print $2}')
   d=$(echo "$dv" | cut -b -23)
   getEpochMillionSecond "$d" dm
   t=$(echo "$dv" | cut -b 25)
   if [ $t = "d" ]
   then
      map_put $c $dm
      continue
   fi
   if [ $t = "e" ]
   then
     map_remove $c start
     if [ -n "$start" ]
     then
         echo "$c => " $((dm - start))
     fi
   fi
done