====== Linux ======

==== Installation ====
  * [[public_v6:qt-installation_auf_ubuntu|Installation von QT auf Ubuntu]]
  * [[public_v6:virtualbox|VirtualBox GuestAdditions, usw.]]
  * [[public_v6:besonderheiten_debian_ubuntu|Tipps für Ubuntu]]
  * [[public_v6:Ubuntu auf dem Beagle Board]]
  * [[public_v6:openSUSE]]

==== Netzwerk ====

  * [[linux:network_namespaces|Network Namespaces]]
  * [[public_v6:ubuntu_als_ipv6-ayiya-tunnelgateway|Ubuntu als IPv6-AYIYA-Tunnelgateway]]
  * [[public_v6:ubuntu|Ubuntu IPv6 manuell konfigurieren]]
  * [[public_v6:miredo_server_konfiguration_ubuntu|Miredo-Server Konfiguration unter Ubuntu]]


Command line ifconfig problems - Not detecting all NICs
<code bash>
ifconfig -a
</code>
==== Linux Device Treiber ====
  * http://tjworld.net/books/ldd3/#ModuleParameters


==== Datei-Berechtigungen ====
  * https://major.io/2007/02/13/chmod-and-the-mysterious-first-octet/

==== Script beim Booten des Systems ausführen ====
  *https://stackoverflow.com/questions/12973777/how-to-run-a-shell-script-at-startup
==== Nutzerverwaltung ====

=== Nutzer anlegen und SSH-Key konfigurieren: ===

<code bash>
sudo useradd <name>
# Password eingeben
mkdir .ssh
# sftp pubkey in 'authorized_keys'
sudo chown -R <name>:<name> ~/.ssh
sudo chmod 700 .ssh && chmod 600 .ssh/*
visudo # add <name> to admins
# ggf. <name> eintragen in /etc/ssh/sshd_config
</code>

=== Account sperren (Konto abgelaufen) ===

    * <code bash># disallow peter from logging in
sudo usermod --expiredate 1 peter</code>
    * [[https://unix.stackexchange.com/questions/570224/whats-the-difference-between-locking-and-expiring-a-user-account|Difference between locking and expiring a user account]]

=== Kontosperre aufheben ===

    * <code bash># set expiration date of peter to Never
sudo usermod --expiredate "" peter</code>

=== Kontosperren konfigurieren und überprüfen  ===
 
    * **Set expiration date:**
      * <code bash>sudo chage -E 2022-12-01 <userName></code>
    * **View account  expiration date:**
      * <code bash>sudo chage -l <userName></code>

=== Non-login User anlegen ===

  * [[https://superuser.com/questions/77617/how-can-i-create-a-non-login-user|How to create a non-login user]]
  * <code bash>sudo useradd --system --shell /bin/false username</code>
  * [[https://www.howtogeek.com/116757/8-ways-to-tweak-and-configure-sudo-on-ubuntu/|Tweak and configure sudo on Ubuntu]]
==== Real-Time Linux ====

  * https://wiki.linuxfoundation.org/realtime/start
  * https://rt.wiki.kernel.org/index.php/Main_Page
  * http://www.frank-durr.de/?p=203

  * http://www.machinekit.io/docs/getting-started/install-rt-kernel-RPi2/
  * https://www.elektronikpraxis.vogel.de/echtzeit-mit-dem-raspberry-pi-a-630497/
==== Kernelmodul ====
  * http://derekmolloy.ie/writing-a-linux-kernel-module-part-1-introduction/
  * https://www.paulkiddie.com/2009/10/creating-a-hello-world-kernel-module-in-linux/
  * http://tldp.org/LDP/lkmpg/2.6/html/index.html (ist relativ alt!)