Loaded: loaded (/usr/lib/systemd/system/systemd-tmpfiles-clean.timer static vendor preset: disabled) systemd-tmpfiles-clean.timer - Daily Cleanup of Temporary Directories.Jun 02 08:02:33 systemd: Started dnf makecache –timer. Loaded: loaded (/usr/lib/systemd/system/dnf-makecache.timer enabled vendor preset: enabled) dnf-makecache.timer - dnf makecache -timer.Jun 02 08:02:33 systemd: Started Run system activity accounting tool every 10 minutes. Loaded: loaded (/usr/lib/systemd/system/sysstat-collect.timer enabled vendor preset: enabled) sysstat-collect.timer - Run system activity accounting tool every 10 minutes.
Jun 02 08:02:33 systemd: Started Discard unused blocks once a week. Loaded: loaded (/usr/lib/systemd/system/fstrim.timer enabled vendor preset: enabled) fstrim.timer - Discard unused blocks once a week.Jun 02 08:02:33 systemd: Started Generate summary of yesterday's process accounting. Loaded: loaded (/usr/lib/systemd/system/sysstat-summary.timer enabled vendor preset: enabled) sysstat-summary.timer - Generate summary of yesterday's process accounting.Jun 02 08:02:33 systemd: Started Daily rotation of log files. Loaded: loaded (/usr/lib/systemd/system/logrotate.timer enabled vendor preset: enabled) logrotate.timer - Daily rotation of log files.Jun 02 08:02:33 systemd: Started Updates mlocate database every day. Loaded: loaded (/usr/lib/systemd/system/mlocate-updatedb.timer enabled vendor preset: enabled)Īctive: active (waiting) since Tue 08:02:33 EDT 2 days ago
mlocate-updatedb.timer - Updates mlocate database every day. The asterisk symbol works the same as it does for file globbing, so this command lists all systemd timer units: ~]# systemctl status *timer These timers trigger events necessary for common maintenance tasks, such as updating system databases, cleaning temporary directories, rotating log files, and more.Īs an example, I'll look at some of the timers on my primary workstation by using the systemctl status *timer command to list all the timers on my host. When Fedora or any systemd-based distribution is installed on a new system, it creates several timers that are part of the system maintenance procedures that happen in the background of any Linux host. For example, a timer can trigger a script or program to run a specific amount of time after an event such as boot, startup, completion of a previous task, or even the previous completion of the service unit called by the timer. Timers can also do some things that cron jobs cannot. Like cron jobs, systemd timers can trigger events-shell scripts and programs-at specified time intervals, such as once a day, on a specific day of the month (perhaps only if it is a Monday), or every 15 minutes during business hours from 8am to 6pm. While doing research for this systemd series, I learned that systemd timers have some very interesting capabilities. I have used timers for a few years, but usually, I learned just enough to perform the task I was working on. Get an ||logic:if then|| block from Logic and put it in the ||input:on button pressed||.I am in the process of converting my cron jobs to systemd timers. 
In Input, find an ||input:on button pressed|| an put it somewhere on the workspace. The time count of seconds will increase by 10 each time the button is pressed. We’ll use button A to add 10 seconds to our time count. We’ll use one button for adding 10 seconds and another button for adding just 1 second. We’ll use the buttons to set the amount of time by adding both 10 seconds and single seconds. There has to be a way to set the time on your watch. Let seconds = 0 Set the time with buttons Place the variable into the ||basic:on start|| block. Drag out a ||variables:set to|| block and change the name with the dropdown to seconds. Ok, in Variables click on Make a Variable. Go into Basic in the toolbox and pull an ||basic:on start|| on to the workspace. We need a variable to keep track of how many seconds are left on the watch. Duration: ~10 minutes Make the time variable Let’s make a countdown timer and see the seconds tick by on your micro:bit watch.
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