Linux Shell Scripting with Bash

Appendix C. Bash Options

Table C.1. shopt Options

Option	Default	Description
-o allexport	Off	All variables that are modified or created are exported.
-o braceexapnd	On	The shell performs curly brace expansion.
cdable_vars	Off	The built-in cd command assumes that unrecognized directories are variables containing a directory path.
cdspell	Off	Spell-checks the directory component in a cd path.
checkhash	Off	Verifies that commands in the command lookup table still exist before trying a path search for the command to run.
checkwinsize	Off	Determines whether the display window has been resized after every command.
cmdhist	On	Allows multiple line history command editing.
dotglob	Off	Allows . files in a pathname expansion.
-o emacs	Off	Use emacs-style line-editing keys.
-o errexit ...