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15th chunk of `systemd.man`
881ec43ec095f93ccdd31b51345d338362ee7b26bf287bf300000001000008c2
      Set default unit to activate on startup. If not specified, defaults
           to default.target. See systemd.unit= above.

       --dump-core
           Enable core dumping on crash. This switch has no effect when running
           as user instance. Same as systemd.dump_core= above.

       --crash-vt=VT
           Switch to a specific virtual console (VT) on crash. This switch has
           no effect when running as user instance. Same as systemd.crash_chvt=
           above (but not the different spelling!).

       --crash-shell
           Run a shell on crash. This switch has no effect when running as user
           instance. See systemd.crash_shell= above.

       --crash-reboot
           Automatically reboot the system on crash. This switch has no effect
           when running as user instance. See systemd.crash_reboot above.

       --confirm-spawn
           Ask for confirmation when spawning processes. This switch has no
           effect when run as user instance. See systemd.confirm_spawn above.

       --show-status
           Show terse unit status information on the console during boot-up and
           shutdown. See systemd.show_status above.

       --log-color
           Highlight important log messages. See systemd.log_color above.

       --log-level=
           Set log level. See systemd.log_level above.

       --log-location
           Include code location in log messages. See systemd.log_location
           above.

       --log-target=
           Set log target. See systemd.log_target above.

       --log-time=
           Prefix console messages with timestamp. See systemd.log_time above.

       --machine-id=
           Override the machine-id set on the hard drive. See
           systemd.machine_id= above.

       --service-watchdogs
           Globally enable/disable all service watchdog timeouts and emergency
           actions. See systemd.service_watchdogs above.

       --default-standard-output=, --default-standard-error=
           Sets the default output or error output for all services and
           sockets, respectively. See systemd.default_standard_output= and
           systemd.default_standard_error= above.

SOCKETS AND FIFOS
       /run/systemd/notify
Title: Systemd Options: Unit Activation, Crash Handling, Logging, and Service Defaults
Summary
This section details various systemd options related to unit activation, crash handling, logging, and service defaults. Options include --unit, --dump-core, --crash-vt, --crash-shell, --crash-reboot, --confirm-spawn, --show-status, --log-color, --log-level, --log-location, --log-target, --log-time, --machine-id, --service-watchdogs, --default-standard-output, and --default-standard-error. Many of these options are mirrored from the kernel command line and often have no effect when running as a user instance. Finally, it notes the existence of sockets and FIFOs at /run/systemd/notify.