README: basic usage
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
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# too-soon
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# too-soon
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alert on upcoming expirations
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alert on upcoming expirations.
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like, certificates for my domain expire too soon.
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Default is expiration within 20 days.
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## inital functionality
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Arguments passed to the tool are PEM encoded x509 files.
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No output at all if all good.
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If any of the PEM x509 files have DNS Names _and_ the notAfter date is within 20day from today, then output text alert to stdout and return non-zero exit code.
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