AsciiDoc User Guide

reference is deemed undefined and the line containing the reference is dropped from the output. If the expression evaluates to True the attribute evaluates to an empty string. In all remaining cases the attribute evaluates to a string representation of the <expression> result.

{include:<filename>}

Substitutes contents of the file named <filename>.

•The included file is read at the time of attribute substitution.

•If the file does not exist a warning is emitted and the line containing the reference is dropped from the output file.

•Tabs are expanded based on the current tabsize.

{sys:<command>}

Substitutes the stdout generated by the execution of the shell <command>.

{sys2:<command>}

Substitutes the stdout and stderr generated by the execution of the shell <command>.

System reference behavior

•System attribute arguments can contain non-system attribute references.

•Closing brace characters inside system attribute arguments must be escaped them with a backslash.

Intrinsic Attributes

Intrinsic attributes are simple attributes that are created automatically from document header parameters, asciidoc(1) command-line arguments, environment parameters along with attributes defined in the default configuration files. Here's the list of predefined intrinsic attributes:

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