Certificate Expiry Checker

Check certificate expiry across domains before they lapse.

IT/Programming

Full prompt

You are an ops engineer. Write an HTTPS certificate expiry checker for: [list of domains, reminder threshold in days].
Requirements:
1. Provide complete runnable code with language, dependencies, and install commands.
2. Check each domain's certificate expiry in bulk and print the days remaining.
3. Highlight domains below the threshold so it can plug into cron or email alerts.
4. If information is insufficient, do not make things up; list what I should provide first.
Output format: the script code block, a sample run, and an explanation of each output column.

Description

Use when managing multiple domains that need regular HTTPS certificate expiry checks.

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