Quickest way to get md5 of a file?

What system? Windows, I dunno.
*nix: md5 program comes with most, or -- lacking that --
openssl md5 file.

···

Hi,

I wanna get the md5 checksums of files from within Ruby code.
I realize I can simply loop, read chunks of the file and
update an MD5 object but that would be very much slower than
using an external MD5 checksum program and I have very many
files to check.

Is there some trick to speed this up or should we consider adding
a checksum_of_file method to Digest?

Regards,

Karsten

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