If you use cron jobs and want to change the time Anacron runs...

[oshunluvr]

My Anacron runs at 7:30 but I want it to start earlier - like before I wake up - because I use it to make my daily snapshot. Anacron is fairly new to me and it appears to ignore times you set in crontab.

There isn't much documentation that I could find about how to change the time anacron activates, but after a little looking around, I discovered this info:

The way to change anacron execution time is with this command:


sudo systemctl edit --full anacron.timer

Then modify the line:


OnCalendar=*-*-* 07..23:30


I wanted to move mine up an hour so I used:

OnCalendar=*-*-* 06..22:30


Again - no docs I could find, so I assumed this means 6am to 10pm on the half-hour (30 minutes).

We'll see tomorrow if I'm right.

[oshunluvr]

OK, finally found more details about the "OnCalendar" entries:

https://www.freedesktop.org/software...endar%20Events

[GreyGeek]

Mmmm... Interesting!
It led me to doing a "man systemd-analyze" and in that man page I found
systemd-analyzedot|dot-Tsvg> systemd.svg
which produced a very beautiful graph of all the interconnections of systemd components. One has to install graphviz before they can use that command. When run, the command produces

[FONT=monospace][COLOR=#000000]:[/COLOR][COLOR=#5454ff][B]~[/B][/COLOR][COLOR=#000000]$ systemd-analyze dot | dot -Tsvg >systemd.svg  [/COLOR]
   Color legend: black     = Requires 
                 dark blue = Requisite 
                 dark grey = Wants 
                 red       = Conflicts 
                 green     = After [/FONT]

and appears to hang, but don't dispare. Without closing the Konsole on which that "hang" occurs, simple open FF and then open systemd.svg. What that beautiful graph is missing is the legend, which is printed in the Konsole. If you close the Konsole and then open the systemd.svg file it will only show a small black square in the upper left corner.

Snowhog, your reference also pointed me to a host of man pages about systemd which I had never read but contain a treasure trove of useful info.

[oshunluvr]

My edit worked as I had hoped. Today's snapshot was taken at 6:38am