Using History Interactively (Bash Reference Manual)| www.gnu.org
Commands For History (Bash Reference Manual)| www.gnu.org
Bash History Builtins (Bash Reference Manual)| www.gnu.org
Bash Builtins (Bash Reference Manual)| www.gnu.org
Top (Bash Reference Manual)| www.gnu.org
Indexes (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