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Related to https://github.com/flokoe/bash-hackers-wiki/issues/10
52 lines
1.8 KiB
Markdown
52 lines
1.8 KiB
Markdown
# The shopt builtin command
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The `shopt` builtin manages [shell options](../../internals/shell_options.md), a
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set of boolean (`on`/`off`) configuration variables that control the
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behaviour of the shell.
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## Synopsis
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shopt [-pqsu] [-o] <OPTNAME...>
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## Description
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Note: Some of these options and other shell options can also be set with
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[the set builtin](../../commands/builtin/set.md).
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### Options
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Option Description
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-------- -----------------------------------------------------------------------------------------------------------------------------
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`-o` Restrict the values of `<OPTNAME...>` to only those also known by [the set builtin](../../commands/builtin/set.md)
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`-p` Print all shell options and their current value. **Default**.
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`-q` Quiet mode. Set exit code if named option is set. For multiple options: `TRUE` if all options are set, `FALSE` otherwise
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`-s` Enable ([s]{.underline}et) the shell options named by `<OPTNAME...>` or list all *enabled* options if no names are given
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`-u` Disabe ([u]{.underline}nset) the shell options named by `<OPTNAME...>` or list all *disabled* options if no names are given
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As noted above, if only `-s` or `-u` are given without any option names,
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only the currently enabled (`-s`) or disabled (`-u`) options are
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printed.
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### Exit code
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When listing options, the exit code is `TRUE` (0), if all options are
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enabled, `FALSE` otherwise.
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When setting/unsetting an option, the exit code is `TRUE` unless the
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named option doesn\'t exitst.
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## Examples
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Enable the `nullglob` option:
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shopt -s nullglob
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## Portability considerations
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The `shopt` command is not portable accross different shells.
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## See also
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- Internal: [The set builtin command](../../commands/builtin/set.md)
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- Internal: [List of shell options](../../internals/shell_options.md)
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