Syntax shopt [-pqsu] [-o] [optname ...] Options -s Enable (set) each optname -u Disable (unset) each optname. -p Display a list of all settable options, with an indication of whether or not each is set. The output is displayed in a form that can be reused as input. (-p is the default action) -q Suppresses normal output; the return status indicates whether the optname is set or unset. If multiple optname arguments are given with '-q', the return status is zero if all optnames are enabled; non-zero otherwise. -o Restricts the values of optname to be those defined for the '-o' option to the set builtin.