# How we document our command line syntax
## Literal text
Use plain text for parts of the command that cannot be changed.
_example:_
`gh help`
The argument help is required in this command.
## Placeholder values
Use angled brackets to represent a value the user must replace. No other expressions can be contained within the angled brackets.
_example:_
`gh pr view <issue-number>`
Replace `<issue-number>` with an issue number.
## Optional arguments
Place optional arguments in square brackets. Mutually exclusive arguments can be included inside square brackets if they are separated with vertical bars.
_example:_
`gh pr checkout [--web]`
The argument `--web` is optional.
`gh pr view [<number> | <url>]`
The `<number>` and `<url>` arguments are optional.
## Required mutually exclusive arguments
Place required mutually exclusive arguments inside braces, separate arguments with vertical bars.
_example:_
`gh pr {view | create}`
## Repeatable arguments
Ellipsis represent arguments that can appear multiple times.
_example:_
`gh pr close <pr-number>...`
## Variable naming
For multi-word variables use dash-case (all lower case with words separated by dashes)
_example:_
`gh pr checkout <issue-number>`
## Additional examples
_optional argument with placeholder:_
`command sub-command [<arg>]`
_required argument with mutually exclusive options:_
`command sub-command {<path> | <string> | literal}`
_optional argument with mutually exclusive options:_
`command sub-command [<path> | <string>]`