check connection from an IP

1 check connection from an IP.sh

#!/bin/bash

curl -s ifconfig.me
curl -s 'https://api.ipify.org'
curl -s 'http://ipv4bot.whatismyipaddress.com/'

2 check if web is up.sh

#!/bin/bash

# check if web is up
curl -s 'http://www.isup.me/n1mh.com' | grep -c "It's just you"

3 check if my ip is up.sh

#!/bin/bash

# check if my ip is up
# - requires: curl
# - output: OK if IP is up, KO if not.
IP=`curl -s 'https://api.ipify.org'` && ( curl -s "http://www.isup.me/$IP" | grep -cq "It's just you" && echo 'OK' ) || echo 'KO'