A simple script to send an e-mail using ssmtp when a site is up (bash)

readme.md

Send an e-mail when a server is online

Install

To install this script globally just run the following command:

wget -NP https://gist.githubusercontent.com/arthurafarias/6c882d324b7238bc0b7dded02a9350e2/raw/95a3d9d81a49811fdba9c2d84c925b58a2f7b3b3/check-server-up.sh /usr/local/bin/check-server.sh

Example

check-server.sh -i 1 -c 200 -a target@example.com -u http://google.com -m "Google is Up"
check-server.sh -i 1 -c 500 -a target@example.com -u http://google.com -m "Google is Down"

check-server-up.sh

#!/bin/bash

while getopts u:i:c:a:m: flag
do
    case "${flag}" in
        u) url=${OPTARG};;
        i) interval=${OPTARG};;
        c) code=${OPTARG};;
        a) email=${OPTARG};;
        m) message=${OPTARG};;
    esac
done

echo "Starting to check URL: $url";
echo "Lookup interval: $interval";
echo "code: $code";
echo "Email: $email";
echo "Message: $message";

while true; do

    result=$(curl -q -L -I $url 2>&1 | grep $code | wc -l)
    
    if [[ $result -gt 0 ]]; then
        echo $(date): "Server is up: $url"
        msg=$(echo "$(date): $message" | sed -E -e s/:/-/g)
        echo $msg | ssmtp $email
        exit
    else
        echo $(date): "Server is down: $url"
    fi

    sleep $interval

done