Temp Files
systemd-tmpfiles provides a structured and configurable method to manage temporary directories and files. When systemd starts a system, one of the first service units launched is systemd-tmpfiles-setup.
This service runs the command systemd-tmpfiles --create --remove . This command reads configuration files from /usr/lib/tmpfiles.d/*.conf, /run/tmpfiles.d/*.conf, and /etc/tmpfiles.d/*.conf.
To ensure systems do not fill up their disks with stale data, a systemd timer unit called systemd-tmpfiles-clean.timer triggers systemd-tmpfiles-clean.service on a regular interval, executing systemd-tmpfiles --clean.
Use the systemd-tmpfiles --clean purge all files which have not been accessed, changed, or modified more recently than the maximum age defined.
The files under /etc/tmpfiles.d/ are meant to configure custom temporary locations.
Example:
Summary
The systemd timer units can execute the recurring jobs.
Command References:
systemd-tmpfiles, tmpfiles.d and stat.