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#!/usr/bin/bash
ip_log=ip.log
function ip {
    now_ip=$(curl ifconfig.me)
    old_ip=$(cat $ip_log)
    if [[ "$now_ip" != "$old_ip" ]]
    then
      echo "$now_ip" > $ip_log
      mutt -s "work home ip changed" xxx@gmail.com < ip.log
    fi
}
ip