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/usr/share/augeas/lenses/dist/securetty.aug is in augeas-lenses 1.4.0-0ubuntu1.1.

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(* Parses entries in /etc/securetty

   Author: Simon Josi <josi@yokto.net> 
*)
module Securetty =
   autoload xfm

   let word = /[^ \t\n#]+/
   let eol = Util.eol
   let empty = Util.empty
   let comment = Util.comment
   let comment_or_eol = Util.comment_or_eol

   let record = [ seq "securetty" . store word . comment_or_eol ]
   let lns = ( empty | comment | record )*

   let filter = (incl "/etc/securetty")
   let xfm = transform lns filter