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let () =
match Sys.argv with
| [|_; file|] ->
let md5 = Digest.to_hex (Digest.file file) in
print_endline (md5 ^ " " ^ file)
| _ ->
prerr_endline "Error: This program needs exactly one parameter.";
prerr_endline "Usage: ocaml md5sum.ml [FILE]";
prerr_endline "Print MD5 (128-bit) checksum.";
exit 1
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