[coreutils] [PATCH] md5sum: Add option to ignore non-existant files

[Luther]

Normally, when I use md5sum, it's when I download a file and an MD5SUMS
file that comes with it. This MD5SUMS file usually lists many files
including the one I downloaded. When I run 'md5sum -c MD5SUMS', I get
many error messages about files that I don't have. Obviously, I don't
care about the files I didn't download, and the error messages make it
difficult to see the output relating to the file that I do care about.

I suggest a new option, -i/--ignore-missing, which ignores any filenames
that do not exist on the filesystem.

In my patch, the option simply suppresses both relevant error messages.
Another approach might be to have digest_check check to see if the file
exists. If it doesn't, don't call digest_file or print the 'FAILED'
message.

Sorry if my patch is a little messy, being in 3 parts. I'm not used to
using git.

HTH, and let me know what you think...
Luther

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0001-md5sum-Added-option-ignore-missing.patch
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0002-src-md5sum-Change-tabs-to-spaces.patch
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0003-doc-coreutils.texi-Document-md5sum-i.patch
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