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systemctl service-log-level
Get or set the runtime log level of a service via D-Bus. More information: https://www.freedesktop.org/software/systemd/man/systemctl.html#service-log-level%20SERVICE%20%5BLEVEL%5D.
- Show the current log level of a service:
systemctl service-log-level {{service_name}}
- Set the log level of a service (the level name can be replaced with a number from 0 to 7):
systemctl service-log-level {{service_name}} {{emerg|alert|crit|err|warning|notice|info|debug}}