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I would like to know the last time my Raspberry Pi Zero (1.7W) was connected to the internet.

OS: Raspberry Pi OS Lite, Kernel version: 5.15 & Debian version: 11 (bullseye)

There was a similar question asked using an Ubuntu machine. However, it has additional capabilities, i.e., a Network Manager. Seems like a solution could be analyzing the /var/log/syslog output but, I am unsure what to sift through using awk or grep.

My goal is to see that if the last time there has been a network connection, and it has has been greater than 18 hours run a script.

Thanks.

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    you may get better results by asking at a linux site, since your question is not really about Raspberry Pi
    – jsotola
    Commented Apr 15, 2022 at 1:08
  • Check the connection pages on your router. Linux doesn't bother recording that info as it has no use or relevance.
    – Dougie
    Commented Apr 15, 2022 at 14:33

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Depends what you mean by "connected to the internet".

All network managers (using DHCP) connect to a DHCP server (usually your router). systemctl status dhcpcd will show when Raspberry Pi OS obtained its lease.

The OS does NOT "connect to the internet" - various processes running may, but you would need to check these.

Probably the most frequent connection to the internet is done by timesyncd.

On Raspberry Pi OS systemctl status systemd-timesyncd.service will show initial sync and timedatectl timesync-status will show detail.
On my system this shows Poll interval: 34min 8s (min: 32s; max 34min 8s) i.e. 2048 seconds and /var/lib/systemd/timesync/clock will show the time this was done.

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