(groff.info)Traps

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5.24 Traps
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"Traps" are locations, which, when reached, call a specified macro.
These traps can occur at a given location on the page, at a given
location in the current diversion, at a blank line, after a certain
number of input lines, or at the end of input.

   Setting a trap is also called "planting".  It is also said that a
trap is "sprung" if the associated macro is executed.

Page Location Traps

Diversion Traps

Input Line Traps

Blank Line Traps

End-of-input Traps