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(groff)Interpolating Registers

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Interpolating Registers
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   Numeric registers can be accessed via the `\n' escape.

 - Escape: \nI
 - Escape: \n(ID
 - Escape: \n[IDENT]
     Interpolate number register with name IDENT (one-character name I,
     two-character name ID).  This means that the value of the register
     is expanded in-place while `gtroff' is parsing the input line.
     Nested assignments (also called indirect assignments) are possible.


          .nr a 5
          .nr as \na+\na
          \n(as
              => 10


          .nr a1 5
          .nr ab 6
          .ds str b
          .ds num 1
          \n[a\n[num]]
              => 5
          \n[a\*[str]]
              => 6