Re: questions about cron.daily

[Alexis Grigoriou <alexis@nanoid.net>]

On Thu, 2023-04-06 at 19:05 +0200, Thomas Schmitt wrote:
> Hi,
> 
> 
> Pierre Frenkiel wrote:
> > crontab -l
> 
> Plus:
>   man 5 crontab
> which has in its section "EXAMPLE CRON FILE"
> 
>        # run five minutes after midnight, every day
>        5 0 * * *       $HOME/bin/daily.job >> $HOME/tmp/out 2>&1
> 
> and explains further up
> 
>       The  format of a cron command is very much the V7 standard,
> with a num‐
>       ber of upward-compatible extensions.  Each line has five time
> and  date
>       fields,  followed by a command, followed by a newline character
> ('\n').
>       ...
>              field          allowed values
>               -----          --------------
>               minute         0-59
>               hour           0-23
>               day of month   1-31
>               month          1-12 (or names, see below)
>               day of week    0-7 (0 or 7 is Sun, or use names)
> 
> So the command shown by Greg Wooledge runs at 6:25 am the comand
> 
>   test -x /usr/sbin/anacron || ( cd / && run-parts --report
> /etc/cron.daily )
> 
> which runs the programs in /etc/cron.daily (by run-parts(8)) if not
> /usr/sbin/anacron exists and is executable.
> 

https://crontab.guru has a very nice explaining also.