get fastest host ping and only output if a host is faster than the one provided in $1

fastest-ping.sh

#!/bin/bash
# pacmac - 2020-03-22
# fast-ping list-of-hosts | current-host
# fast-ping "uk-berkshire-2-ca-version-2.expressnetw.com,uk-east-london-ca-version-2.expressnetw.com" "uk-east-london-ca-version-2.expressnetw.com"
# fast-ping "uk-berkshire-2-ca-version-2.expressnetw.com,uk-east-london-ca-version-2.expressnetw.com"

## Initial Defaults   
Smallest=1000000
Server=""

## Params
Tolerance=3
Pings=5

## Command Vars
hosts=$1;
host="$2"

## Main Ping Function
func_ping () {
  PingMs1=`ping -c $Pings -q -i .2 $myHost 2>/dev/null | grep avg | awk -F'/' '{print $5}'  | sed -e "s/ ms//"`;
  PingMs=${PingMs1/./}
  PingMs=$((PingMs / 1000))
  #echo "$myHost $PingMs"
}

## Get Current Host
func_host () {
  _host=$(cat $output | tr -d "\n" | tr -d "\r")
  host=$(echo $_host | awk '{print $2}')
  # echo -e "CURRENT:\t$host"
}

## Get Current Host Ping
func_host_ping () {
  myHost=$host;
  func_ping;
  Smallest=$PingMs;
  Server=$host;
}

## Get Fastest Host ( in:myHost out:Server, Smallest )
func_fastping () {
  for myHost in $(echo $hosts | sed "s/,/ /g");do
    func_ping;
    
    ## DEBUG
    # echo -e "$PingMs\t\t$myHost"
  
    if [ $PingMs -gt 0 ] && [ "$((Smallest - PingMs))" -gt $Tolerance ];then 
      Server=$myHost
      Smallest=$PingMs 
    fi;
  done
}


if [ -n "$host" ]; then
  func_host_ping;
  func_fastping;

  ## if host, then only reply if changed.
  if [ "$Server" != "$host" ]; then
    echo "$Server";
  fi

else
  ## reply with fastest
  func_fastping;
  echo "$Server"
fi