Special Builtins (Bash Reference Manual)| www.gnu.org
Positional Parameters (Bash Reference Manual)| www.gnu.org
Shell Parameters (Bash Reference Manual)| www.gnu.org
Bash Builtins (Bash Reference Manual)| www.gnu.org
Bash POSIX Mode (Bash Reference Manual)| www.gnu.org
Redirections (Bash Reference Manual)| www.gnu.org