IOS Command Syntax
A command might require one or more arguments.
boldface
Boldface text indicates commands and keywords that you enter literally as shown.
italics
Italic text indicates arguments for which you supply values.
[x]
Square brackets indicate an optional element (keyword or argument).
{x}
Braces indicate a required element (keyword or argument).
[x {y | z }]
Braces and vertical lines within square brackets indicate a required choice within an optional element. Spaces are used to clearly delineate parts of the command.