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    <div style="width: 75%; margin-left: auto; margin-right: auto;">
        <h1>Ultimate Notifier Script</h1>
<p>Der Dienst <a href="http://ultimatenotifier.com/">Ultimate Notifier</a> erlaubt es relativ problemlos, zum Beispiel mittels curl Push-Notifications an ein iPhone zu senden. Darauf basierend können Shell Skripte geschrieben werden, welche regelmäßig als Cron-Job gestartet werden. So kann man sich zum Beispiel über eine geänderte Public IP informieren lassen. Dafür muss dieses Skript irgendwo gespeichert werden:</p>
<pre class="sh_sh">
#!/bin/sh

ipfile=".currentip"
service="ifconfig.me"
user="username"
pass="password"
message="IP:"

ip=`curl -s $service`
touch $ipfile
lastip=`cat $ipfile`
if [ "$ip" != "$lastip" ]; then
    echo "New public IP. Sending notification!"
    curl -s "https://www.ultimatenotifier.com/items/User/send/${user}/message=${message}%20${ip}/password=${pass}"
fi
cp /dev/null $ipfile
echo $ip > $ipfile
</pre>

<p>Es liest die aktuelle öffentliche IP mittels curl vom Dienst <a href="http://ifconfig.me">ifconfig.me</a> aus und vergleicht diese mit der zwischengespeicherten IP in einer Datei namens .currentip. Unterscheiden sich die IPs, wird eine Push Notification gesendet und die neue IP gespeichert.</p>
<p>Mit dem Befehl</p>
<pre>crontab -e</pre>

<p>Kann ein Eintrag ins cronfile hinzugefügt werden, sodass das Skript regelmäßig gestartet wird. Ein Beispiel, für 30 Minuten:</p>
<pre>*/30 * * * * /Users/anon/bin/ipnotify.sh</pre>

<p>Der Code findet sich auch auf <a href="https://github.com/xythobuz/Snippets/blob/master/ipnotify.sh">GitHub</a>.</p>
<p>Natürlich kann dieses Prinzip beliebig erweitert werden. Dieses Bash Skript wird auf meinem Server alle 5 Minuten von cron gestartet und berichtet über eventuelle Probleme.</p>
<pre class="sh_sh">
#!/bin/bash

# Checks for Health of Server and sends notifications to iPhone in case of error
# Checks for:
# - HDD Temperature
# - HDD Space
# - CPU Usage
# Sends a notification via UltimateNotifier
# Depends on bash, wget, hddtemp, grep, awk, sed, ps, sort and head.

# ------------------------------
# ------------------------------

# Your UltimateNotifier Password
UNUsername="YourUserName"
UNPassword="YourPassWord"

# Check for free space
hddMountPoint="bay" # greps for this in mounted hdds
maxPercentFull=75 # minimum percentage to send notification

# Check for CPU Usage of processes
maxCpuUsage=750 # Is in tenths of a percent (420 => 42%)

# Checks hdd temperature
# Depends on hddtemp tool
hddDevice="/dev/sda"
maxHddTemp=50

# ------------------------------
# ------------------------------

# Set $message to your Message and then call this...
function sendNotification {
  wget "https://www.ultimatenotifier.com/items/User/send/${UNUsername}/message=${message}/password=${UNPassword}" -O /dev/null -q
  echo "$message"
}

# ------------------------------
# ------------------------------

# Check for hdd temperature
hddTemp=`/usr/sbin/hddtemp ${hddDevice} | awk '{print $4}' | awk -F 'Â°' '{print $1}'`
if [ $hddTemp -gt $maxHddTemp ]; then
  message="Marvin's HDD has reached ${hddTemp}Â°C!"
  sendNotification
fi

# Check for free space on hdd
spaceUsed=`df -h | grep ${hddMountPoint} | awk '{print $5}' | sed 's/%//'`
if [ $spaceUsed -gt $maxPercentFull ]; then
  message="Marvin's HDD is ${spaceUsed}% full!"
  sendNotification
fi

# Check for most cpu intensive process, report if usage too high
processName=`ps -e -o cp,args | sed -e 's/^[ \\t]*//' | awk -F " " '{print $1, $2}' | sed -e '1d' | sort -rn | head -1 | awk '{print $2}'`
processUsage=`ps -e -o cp,args | sed -e 's/^[ \\t]*//' | awk -F " " '{print $1, $2}' | sed -e '1d' | sort -rn | head -1 | awk '{print $1}'`
if [ $processUsage -gt $maxCpuUsage ]; then
  processUsage=`echo "${processUsage} / 10.0" | bc -q`
  message="${processName} needs ${processUsage}% CPU!"
  sendNotification
fi
</pre>
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