gnus: Active File Format

 
 11.7.9.1 Active File Format
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 The active file lists all groups available on the server in question.
 It also lists the highest and lowest current article numbers in each
 group.
 
    Here’s an excerpt from a typical active file:
 
      soc.motss 296030 293865 y
      alt.binaries.pictures.fractals 3922 3913 n
      comp.sources.unix 1605 1593 m
      comp.binaries.ibm.pc 5097 5089 y
      no.general 1000 900 y
 
    Here’s a pseudo-BNF definition of this file:
 
      active      = *group-line
      group-line  = group spc high-number spc low-number spc flag <NEWLINE>
      group       = <non-white-space string>
      spc         = " "
      high-number = <non-negative integer>
      low-number  = <positive integer>
      flag        = "y" / "n" / "m" / "j" / "x" / "=" group
 
    For a full description of this file, see the manual pages for ‘innd’,
 in particular ‘active(5)’.