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 (set) the shell options named by <OPTNAME...> or list all enabled options if no names are given |
-u | Disabe (unset) 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