====== Informationen ======

  * http://www.admin-magazin.de/Das-Heft/2013/05/Udev-mit-virtuellen-Maschinen
  * http://www.admin-magazin.de/Das-Heft/2013/02/Geraetenamen-herausfinden
  * disable firewall:
  * iptables -X
  * iptables -t nat -F
  * iptables -t nat -X
  * iptables -t mangle -F
  * iptables -t mangle -X
  * iptables -P INPUT ACCEPT
  * iptables -P FORWARD ACCEPT
  * iptables -P OUTPUT ACCEPT
  * iptables -F


  * To change all the directories to 755 (-rwxr-xr-x):
  * find /opt/lampp/htdocs -type d -exec chmod 755 {} \;

  * http://stedolan.github.io/jq/
  * http://openbook.rheinwerk-verlag.de/shell_programmierung/shell_004_004.htm#RxxKap00400404004DB01F03B175