[Alug]hexdump

Hello ALUG list, Does anyone know to use the hexdump program? I've been trying all night (and am at serious risk of fatal caffeine poisoning!) All I want it to do is print every byte of a file in hex notation without any other rubbish (no indexes, no ASCII, no spaces, no line feeds, no nothing). It claims that you can pass it a format string in the same format as fprintf() so I tried this: $ hexdump -e "%x" {filename} >{outputfile} but it just said that my format string was a "bad format {%x}". Any help would be very much appreciated! Richard.