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From: Lem Novantotto <Lem@none.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: How Long Since Last Kernel Update
Date: Tue, 14 Jan 2025 10:13:03 -0000 (UTC)
Organization: A noiseless patient Spider
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Il Tue, 14 Jan 2025 04:44:06 -0000 (UTC), Lawrence D'Oliveiro ha scritto:

> bc <<<"scale = 1; ($(date +%s) - $(stat -c%Y /vmlinuz)) / 86400"

Well, here vmlinuz is in /boot: so /boot/vmlinuz, above.

If you like to know when the system has been installed, and / is on a
fileystem like ext4, that nowadays saves the creation time, an option is:

$ ls -l -d --time=birth /

But be careful: sometimes it could just not work, or be inaccurate.
-- 
Bye, Lem
		Talis erit dies qualem egeris