1.7 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]
===== 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__et) the shell options named by ''<OPTNAME...>'' or list all //enabled// options if no names are given| |''-u''|Disabe (__u__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