• Executable and Linkable Format (ELF)
• Ricing
• Service／Daemon Manager - (SystemV - Upstart - Systemd - Launchd)
• UNIX - Boot Process
• UNIX - File Stuff
• UNIX - Package Managers (All)
• UNIX - Portable Operating System Interface (POSIX)
• UNIX - Process
• UNIX - Terminal & Shell
• Unix Pluggable Authentication Modules (PAM)