One of the major features of System V or SysV Unix operating systems is the use of the /etc/init.d startup/shutdown directory structure. The origin of the name if from AT&T's Unix versions.

Linux (often pronounced LIH-nuhks with a short "i") is a UNIX-like operating system that was designed to provide personal computer users a free or very low-cost operating system comparable to traditional and usually more expensive UNIX systems. Linux has a reputation as a very efficient and fast-performing system. Linux's kernel (the central part of the operating system) was developed by Linus Torvalds at the University of Helsinki in Finland. To complete the operating system, Torvalds and other team members made use of system components developed by members of the Free Software Foundation for the GNU project.

Distributions:

• Debian
  
• Ubuntu
  
• Redhat
  
• Syslinux
  
• OpenWRT
  

General:

• login
  
• Linux Kernel
  
• Linux Bootstrap
  
• Linux Filesystems
  
• Volume Management
  
• Lilo (LInux LOader)
  
• GRUB
  
• Telnetd
  
• Serial Console
  
• Power Management
  
• Cross Compiling
  
• User Management
  

Utils / Applications:

• Stress
  
• Dialog (cdialog)
  

Networking:

• General
  
• NFS Root Bootstrap
  
• PCMCIA Wireless
  
• pppd Configuration
  
• IP Forwarding
  
• OpenVPN
  
• Securing Linux
  
• firewall - IPChains
  
• firewall - IPTables
  

Miscellaneous:

• Linux Links