GNU Info

(texinfo)set clear value

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`@set', `@clear', and `@value'
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  You can direct the Texinfo formatting commands to format or ignore
parts of a Texinfo file with the `@set', `@clear', `@ifset', and
`@ifclear' commands.

  Brief descriptions:

`@set FLAG [VALUE]'
     Set the variable FLAG, to the optional VALUE if specifed.

`@clear FLAG'
     Undefine the variable FLAG, whether or not it was previously
     defined.

`@ifset FLAG'
     If FLAG is set, text through the next `@end ifset' command is
     formatted.  If FLAG is clear, text through the following `@end
     ifset' command is ignored.

`@ifclear FLAG'
     If FLAG is set, text through the next `@end ifclear' command is
     ignored.  If FLAG is clear, text through the following `@end
     ifclear' command is formatted.

set value

Expand a flag variable to a string.

ifset ifclear

Format a region if a flag is set.

value Example

An easy way to update edition information.