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52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
# The shopt builtin command
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The `shopt` builtin manages [shell options](/internals/shell_options), 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).
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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) |
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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 (<u>s</u>et) the shell options named by `<OPTNAME...>` or list all *enabled* options if no names are given |
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| `-u` | Disabe (<u>u</u>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)
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- Internal: [List of shell options](/internals/shell_options)
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