waitup bash function

gistfile1.txt

#!/bin/bash

# waitup
#
# A utility function for show notification when a server get ssh ready
#
# install: 
#    brew installterminal-notifier
#
# usage: 
#    waitup IP

function waitup() {
    while true; do
      nc -vz $1 22
      if [[ $? == 0 ]]; then
        terminal-notifier -message "$1 up"
        return
      fi
    done
}