Monitoring script

#!/bin/bash
function info(){
   cn=0
   vl=$(wget https://docker.erbie.io/version>/dev/null 2>&1 && cat version|awk '{print $2}')
   while true
   do
            echo "the monitor version is $vl"
            echo "$cn second."
            echo "node $1"
            rs1=`curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"net_peerCount","id":64}' 127.0.0.1:$1 2>/dev/null`
            count=$(parse_json $rs1 "result")
            echo "Number of node connections: $((16#${count:2}))"
            rs2=`curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_blockNumber","id":64}' 127.0.0.1:$1 2>/dev/null`
            blckNumber=$(parse_json $rs2 "result")
            echo "Block height of the current peer: $((16#${blckNumber:2}))"
            sleep 5
            clear
            let cn+=5
   done
}

function parse_json(){
   echo "${1//\"/}"|sed "s/.*$2:\([^,}]*\).*/\1/"
}

function main(){
   if [[ $# -eq 0 ]];then
            info 8545
   else
            info $1
   fi
}

main "$@"