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  1. -- hex dump
  2. -- usage: lua xd.lua < file
  3.  
  4. local offset=0
  5. while true do
  6.  local s=io.read(16)
  7.  if s==nil then return end
  8.  io.write(string.format("%08X  ",offset))
  9.  string.gsub(s,"(.)",
  10.         function (c) io.write(string.format("%02X ",string.byte(c))) end)
  11.  io.write(string.rep(" ",3*(16-string.len(s))))
  12.  io.write(" ",string.gsub(s,"%c","."),"\n")
  13.  offset=offset+16
  14. end
  15.