This document contains a set of frequently-asked questions concerning Bash, the GNU Bourne-Again Shell. Bash is a free and default command interpreter with advanced features for both interactive use and shell programming under Linux. Also don’t forget TLDP bash guide / Advanced Bash-Scripting Guide.
AdvFS is a file system that was developed by Digital Equipment Corp and continues to be part of HP’s Tru64 operating system. AdvFS has been released under GPL v2.