Linux Sysadmin

DBUS
DRBD
Debian
Debugging
Filesystem
GPG
IPMI
Kernel Tracing
LVM
Linux Insides
Linux-Commands
Linux-HA
Linux-Networking
Linux-Sysadmin
Linux-Virtualization
Mail
Package Management
Partitioning
Quota
RAID
SSH
Security-News-Feeds
Solaris
SysRq
Sysctl - Net
ffmpeg
jq
screen-vs-tmux
sssd
systemd
ulimit
vi
vi - Advanced

Linux Development

APIs
Bash
Bash Associative Array
Bash Functions
Bash Regex
Color Distance
Dev-Misc
GCC
Glib
Glib Testing
Glib XDG Migration
Linting
PHP
Packaging
Python
Ruby
Ruby Bundler
SaaS Solutions
Scripting
Shell Problems
Shell-Scripting
autotools
awk
gdb
packages.json
rvm
sed

Linux Virtualization

AWS - CLI
AWS - Cost
Deis
Docker
EC2 API Tools
ESX
Flynn
Heroku
Juju
KVM
LXC
LXD
OpenNebula
OpenStack
OpenVZ
VM Tuning
Vagrant
Vagrantfile
VirtualBox
Xen
heroku
kubernetes
rkt
systemd
vSphere

Services

Apache
CouchDB
Couchbase
ElasticSearch
Eureka
GlusterFS
Hadoop
Java
MongoDB
MySQL
NFS
Node.js
PgBouncer
Postgres
RabbitMQ
Redis
Squid
Tomcat
Webserver
Zookeeper
etcd
htaccess
memcached
nginx
sqlite
zuul

Security

AppArmor
HTTPS
Nmap
OpenSSL
Package Vulnerabilities
SELinux
SIEM
SSL-Certificates
Secure REST APIs
Security Auditing
Security-News-Feeds
Session Mgmt
Unhide Processes

IT Ops

Ansible
Bower
Chef
Gerrit
Git
Hubot - Howto
IT-Ops
Jenkins
Maven
Mcollective
Monitoring
Puppet
Puppet - Iterating
Solutions Automation
Solutions Monitoring
Solutions NoSQL
Solutions Virtualization
Splunk
cfengine
salt
saltstack

Agile

Depth of Kanban
Kanban - Kaizen
Scrum
Scrumban
Semantic Services
Team of Teams

Languages

CSS
JSON
JSON Schema
Node.js
Perl
Regex101
SVG Attributes
SVG Elements
XHTML
XML 1.0
XML 1.1
XSD
XSLT 2.0
YAML

PLEAC Codebooks

PHP Arrays
PHP Date/Time
PHP Filesystem
PHP Functions
PHP Hashes
PHP IPC
PHP Numbers
PHP Strings
Perl Arrays
Perl CGI
Perl Classes
Perl Date/Time
Perl Directories
Perl File Access
Perl File Content
Perl Functions
Perl Hashes
Perl IPC
Perl Internet
Perl Matching
Perl Modules
Perl Numbers
Perl References
Perl Sockets
Perl Strings
Python Arrays
Python CGI
Python Classes
Python Date/Time
Python Directories
Python File Access
Python File Content
Python Functions
Python Hashes
Python IPC
Python Internet
Python Matching
Python Modules
Python Numbers
Python References
Python Sockets
Python Strings
Ruby Arrays
Ruby CGI
Ruby Classes
Ruby Date/Time
Ruby Directories
Ruby File Access
Ruby File Content
Ruby Functions
Ruby Hashes
Ruby IPC
Ruby Internet
Ruby Matching
Ruby Modules
Ruby Numbers
Ruby References
Ruby Sockets
Ruby Strings

Code Examples

Glib
Glib GRegex
Java Debugging
Javascript strptime
Javascript toggle visibility
Javascript void0
Linux HTML Widgets
PHP Arrays
PHP curl_setopt
PHP date
PHP explode
PHP implode
PHP ini_set
PHP preg_match
PHP preg_replace
PHP str_replace
PHP strpos
PHP ternary operator
PHP unserialize
Perl Regex
PyGI GStreamer
PyGI GnomeKeyring
PyGI GtkStatusIcon
Python Sockets
Python Syntax
Python re.match
Python re.sub
Python simplehttpserver
Regex Overview
Ruby Regex
Syndication