md5(1) and cal(1)

[Eitan Adler]

> D> 2. Why doesn't md5(1) have a "check" option?  Seems to me requiring a
> D> manual inspection is error-prone at best, and makes scripting
> D> unecessarily complicated.
>

Would something like the attached patch be good?
It adds a -c option for a string to check against. It prints "[failed]" if
the string does not match the files md5 unless in -q mode.
It also returns 2 to indicate md5 match failure for use in scripts.
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