compare_myip.sh

#!/bin/bash
# Copyright © 2018 coord.e
# This work is free. You can redistribute it and/or modify it under the
# terms of the Do What The Fuck You Want To Public License, Version 2,
# as published by Sam Hocevar. See the COPYING file for more details.

ITERATION_NUM=20

CANDIDATES=("ifconfig.me" "icanhazip.com" "ipinfo.io/ip" "checkip.amazonaws.com" "inet-ip.info" "httpbin.org/ip" "ifconfig.co")
declare -A RESULTS

for idx in $(seq $ITERATION_NUM); do
  echo -ne "Iteration $(printf %02d $idx)"
  for item in ${CANDIDATES[@]}; do
    elapsed=$(TIMEFORMAT='%3R'; { time curl -s $item > /dev/null ; } 2>&1 | tr -d '\n')
    if [ $idx -eq 1 ]; then
      RESULTS[$item]=$elapsed
    else
      RESULTS[$item]=$(bc <<< ${RESULTS[$item]}+$elapsed)
    fi
    echo -n '.'
  done
  echo
  sleep 5
done

echo "Done."

for item in ${!RESULTS[@]}; do
  average=$(bc <<< "scale=4; ${RESULTS[$item]}/$ITERATION_NUM")
  echo -e "$item:\t$average"
done