Info Catalog groff: Setting Registers groff: Registers groff: Auto-increment

groff: Interpolating Registers

 
 5.8.2 Interpolating Registers
 -----------------------------
 
 Register contents are interpolated with the '\n' escape sequence.
 
  -- Escape sequence: \ni
  -- Escape sequence: \n(id
  -- Escape sequence: \n[ident]
      Interpolate register with name IDENT (one-character name I,
      two-character name ID).  '\n' is interpreted even in copy mode
      (⇒Copy Mode).  If the register is undefined, it is created
      and assigned a value of '0', that value is interpolated, and a
      warning in category 'reg' is emitted.  ⇒Warnings, for
      information about the enablement and suppression of warnings.
 
           .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
 

Info Catalog groff: Setting Registers groff: Registers groff: Auto-increment