GNU Info

(groff)Traps

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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, after a certain number of input
lines or at the end of input.

Page Location Traps

Diversion Traps

Input Line Traps

End-of-input Traps