-d

Detach and run in the background.

-D

Print debug messages to standard error.

-c

Limit the number of events executed in parallel.

-e

Delay the execution of RUN instructions by the given number of seconds. This option might be useful whendebugging system crashes during coldplug caused by loading non-working kernel modules.

-t

Set the number of seconds to wait for events to finish. After this time, the event will be terminated. Thedefault is 180 seconds.

-N

Specify when systemd-udevd should resolve names of users and groups. When set to early (the default),names will be resolved when the rules are parsed. When set to late, names will be resolved for everyevent. When set to never, names will never be resolved and all devices will be owned by root.

-h

Print a short help text and exit.

--version

Print a short version string and exit.KERNEL COMMAND LINEParameters starting with "rd." will be read when systemd-udevd is used in an initrd.udev.log_priority=, rd.udev.log_priority=Set the log level.udev.children_max=, rd.udev.children_max=Limit the number of events executed in parallel.udev.exec_delay=, rd.udev.exec_delay=Delay the execution of RUN instructions by the given number of seconds. This option might be useful whendebugging system crashes during coldplug caused by loading non-working kernel modules.udev.event_timeout=, rd.udev.event_timeout=Wait for events to finish up to the given number of seconds. This option might be useful if events areterminated due to kernel drivers taking too long to initialize.net.ifnames=Network interfaces are renamed to give them predictable names when possible. It is enabled by default;specifying 0 disables it.