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摘自man man命令:

Conventional section names include NAME, SYNOPSIS, CONFIGURATION, DESCRIPTION, OPTIONS, EXIT STATUS, RETURN VALUE, ERRORS, ENVIRONMENT, FILES, VERSIONS, CONFORMING TO,

NOTES, BUGS, EXAMPLE, AUTHORS, and SEE ALSO.

The following conventions apply to the SYNOPSIS section and can be used as a guide in other sections.

bold text type exactly as shown.

italic text replace with appropriate argument.

[-abc] any or all arguments within [ ] are optional.

-a|-b options delimited by | cannot be used together.

argument ... argument is repeatable.

[expression] ... entire expression within [ ] is repeatable.

Exact rendering may vary depending on the output device. For instance, man will usually not be able to render italics when running in a terminal, and will typically

use underlined or coloured text instead.

The command or function illustration is a pattern that should match all possible invocations. In some cases it is advisable to illustrate several exclusive invoca‐

tions as is shown in the SYNOPSIS section of this manual page.