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/usr/share/ettercap/lua/core/ec_string.lua is in ettercap-common 1:0.8.1-3+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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starts_with = function (str,val)
   if str == nil or val == nil then
      return 0
   end

   local spos, endpos = string.find(str,val)
   if spos == nil   then
      return 0
   end
   return 1
end