GNU/Linux

Linux veteran, since 2001 (distributions I have had hands on experience):

• Arch Linux
• Ubuntu
• Debian GNU/Linux
• Oracle Linux (AKA Unbreakable Enterprise Linux, Oracle Enterprise Linux)
• Red Hat Enterprise Linux
• CentOS
• Fedora (Core)
• Gentoo
• Mandrake
• Slackware
• Knoppix
• BackTrack / Kali Linux
• openSUSE
• System Rescue CD
• Tails
• Ipfire

UNIX

Mac OS X

• 10.4 Tiger
• 10.5 Leopard
• 10.6 Snow Leopard
• 10.7 Lion

Solaris 10 x86

FreeNAS 8.3.x (based on FreeBSD 8.3.x) 

Solaris 11.1 x86 (ZFS v6 zpool v34)

Knowledge Base

• Arch Linux
• Arch Linux vpnc
• Core Dump
• Debian
• Disable PC Speaker
• Gentoo
• iBus
• Install and Config VNC Server
• Install Cisco VPN Client on Ubuntu Linux
• Install Oracle Database on Linux
• LVM
• Oracle Linux
• Remove old Linux kernel
• Samba
• Set Java Environment Variables
• Sysfs and procfs
• Ubuntu vpnc
• vpnc
• Linux boot
• kill
• Release reserved blocks of Ext file system
• Btrfs
• GRUB2
• Nginx
• In Memory Filesystems
• conky
• Run level and init scripts
• Package Managers
• Open Files and Open File Descriptors
• Linux Security Configuration Guide
• Ksplice
• GNOME 3 Fallback with Compiz
• Use OpenSSL to generate key pairs
• Install Java Manually on Linux
• Monit
• rsync
• Enlightenment
• DRBD
• systemd
• Mount WebDAV on Linux
• Linuxbrew
• kpatch
• Fast boot using kexec
• Firefox Tips
• Ubuntu
• Use inotify to monitor file system activity
• Zsh