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(groff)Input Line Traps

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Input Line Traps
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 - Request: .it n macro
     Sets an input line trap.  N is the number of lines of input which
     may be read before "springing" the trap, MACRO is the macro to be
     invoked.  Request lines are not counted as input lines.

     For example, one possible use is to have a macro which prints the
     next N lines in a bold font.


          .de B
          .it \\$1 B-end
          .ft B
          ..
          .de B-end
          .ft R
          ..