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7.5.6.10 Option Argument Optional

This attribute indicates that the user does not have to supply an argument for the option. This is only valid if the arg-type is string (see section Arg Type String) or keyword (see section Arg Type Keyword). If it is keyword, then this attribute may also specify the default keyword to assume when the argument is not supplied. If left empty, arg-default (see section Default Option Argument Value) or the zero-valued keyword will be used.

This is overridden and the options are required if the libopts library gets configured with --disable-optional-args.


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