Geoffrey Leach <ge...@hughes.net> writes:
> I have this line in /etc/crontab:
>
>       30 23 * * * geoff /usr/local/bin/fp.pl
>
> which executes the program every day at 2330.  The script terminates by 
> executing system 'sudo systemctl start poweroff.target';
>
> Generally this works as expected.
>
> However, when I realize that the shutdown happened too soon, and I 
> restart the system, it re-executes the script.  
>
> Any suggestions as to where I've gone wrong?

You didn't wait a minute for before restarting the computer? ;-)

Look at the top of /etc/cron.hourly/0anacron and add logic just like
this to your script.  Cron is stateless across reboots (as far as I
know) and has no way to tell if it already ran.  You have to record that
fact yourself.

-wolfgang
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