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Some usefull command line:

Show which task have been installed on the server like a dns-server or a lamp-server

    tasksel --list-tasks

Change the hostname Kernel which is different from the /etc/hostname

    sysctl kernel.hostname=NEW_HOSTNAME

find files & directories named “query” :

    find -name "query"
    locate "query"

package management :

Configuration of the Advanced Packaging Tool (APT) system repositories is stored in the /etc/apt/sources.list file and the /etc/apt/sources.list.d directory. An example of this file is referenced here, along with information on adding or removing repository references from the file.

These links are things I might be interested in at some point in my career.

  • rtfm : https://help.ubuntu.com/14.04/serverguide/introduction-chap.html
  • backuping : https://help.ubuntu.com/14.04/serverguide/backups.html
  • package management : https://help.ubuntu.com/14.04/serverguide/package-management.html
  • Automatic Updates : https://help.ubuntu.com/14.04/serverguide/automatic-updates.html
  • networking : https://help.ubuntu.com/14.04/serverguide/networking.html
  • OpenSSH Server : https://help.ubuntu.com/14.04/serverguide/openssh-server.html
  • Puppet : https://help.ubuntu.com/14.04/serverguide/puppet.html
  • Zentyal (email server & more) : https://help.ubuntu.com/14.04/serverguide/zentyal.html

Linux Kernel in a Nutshell : http://www.kroah.com/lkn/