Finding either boot time or login time

[Mark J. Reed]

One-liner to display the boot time:

$ perl -lane 'print ~~localtime(time-$F[0])' /proc/uptime

Or format it however you want, e.g. for ISO8601:

$ perl -MPOSIX -lane 'print strftime("%FT%T", localtime(time-$F[0]))'
/proc/uptime

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