-- hex dump
-- usage: lua xd.lua < file

local offset=0

while 1 do
 local s=io.read(16)
 if s==nil then return end
 io.write(string.format("%08X  ",offset))
 string.gsub(s,"(.)",function (c) io.write(string.format("%02X ",string.byte(c))) end)
 io.write(string.rep(" ",3*(16-string.len(s))))
 io.write(" ",string.gsub(s,"%c","."),"\n") 
 offset=offset+16
end