Top (Bash Reference Manual)| www.gnu.org
Indexes (Bash Reference Manual)| www.gnu.org
Command Execution Environment (Bash Reference Manual)| www.gnu.org
Bash POSIX Mode (Bash Reference Manual)| www.gnu.org
The Shopt Builtin (Bash Reference Manual)| www.gnu.org
Bash Variables (Bash Reference Manual)| www.gnu.org
The Set Builtin (Bash Reference Manual)| www.gnu.org