shopt

List all shell options with their status

$ shopt

$ shopt -s [optname]

$ shopt -u [optname]

$ shopt -q [optname] && echo "enabled"

$ shopt -s extglob

$ shopt -s nocaseglob

$ shopt -s dotglob

$ shopt -p

shopt [-pqsu] [-o] [optname ...]

shopt is a Bash builtin that enables or disables shell options for the current session. These options modify shell behavior including globbing, history handling, directory navigation, and command completion.
Without arguments, shopt lists all options and their current status. Use -s to enable and -u to disable specific options. The -q flag tests options silently, setting exit status 0 if enabled, 1 if disabled.
Options set with shopt persist only for the current session. Add shopt commands to ~/.bashrc for permanent configuration.

-p

Print shell options in a format reusable as input

Quiet mode; suppress output, return status only

Set (enable) the specified options

Unset (disable) the specified options

Restrict to options also settable with set -o

cdspell

Auto-correct minor spelling errors in cd arguments

Include files starting with . in glob patterns

Enable extended pattern matching operators

Enable ** recursive directory matching

Append to history file instead of overwriting

Case-insensitive filename globbing

Empty glob patterns expand to nothing instead of themselves

Enable alias expansion (default in interactive shells)

shopt is Bash-specific and not available in other shells like zsh, dash, or ksh, which have their own option mechanisms. The -o flag provides compatibility with options from the set builtin.

shopt is a Bash builtin introduced in Bash 2.0 (1996) to provide a cleaner interface for shell options compared to the set builtin. It continues to be the primary method for configuring Bash behavior.

set(1), bash(1)