1.8 KiB
The shopt builtin command
The shopt builtin manages shell options, a
set of boolean (on/off) configuration variables that control the
behaviour of the shell.
Synopsis
shopt [-pqsu] [-o] <OPTNAME...>
Description
Note: Some of these options and other shell options can also be set with the set builtin.
Options
Option Description
-o Restrict the values of <OPTNAME...> to only those also known by the set builtin
-p Print all shell options and their current value. Default.
-q Quiet mode. Set exit code if named option is set. For multiple options: TRUE if all options are set, FALSE otherwise
-s Enable ([s]{.underline}et) the shell options named by <OPTNAME...> or list all enabled options if no names are given
-u Disabe ([u]{.underline}nset) the shell options named by <OPTNAME...> or list all disabled options if no names are given
As noted above, if only -s or -u are given without any option names,
only the currently enabled (-s) or disabled (-u) options are
printed.
Exit code
When listing options, the exit code is TRUE (0), if all options are
enabled, FALSE otherwise.
When setting/unsetting an option, the exit code is TRUE unless the
named option doesn't exitst.
Examples
Enable the nullglob option:
shopt -s nullglob
Portability considerations
The shopt command is not portable accross different shells.
See also
- Internal: The set builtin command
- Internal: List of shell options