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systemd-update-utmp.service(8) [centos man page]

SYSTEMD-UPDATE-UTMP.SERVICE(8)				    systemd-update-utmp.service 			    SYSTEMD-UPDATE-UTMP.SERVICE(8)

NAME
systemd-update-utmp.service, systemd-update-utmp-runlevel.service, systemd-update-utmp - Write audit and utmp updates at bootup, runlevel changes and shutdown SYNOPSIS
systemd-update-utmp.service systemd-update-utmp-runlevel.service /usr/lib/systemd/systemd-update-utmp DESCRIPTION
systemd-update-utmp-runlevel.service is a service that writes SysV runlevel changes to utmp and wtmp, as well as the audit logs, as they occur. systemd-update-utmp.service does the same for system reboots and shut-down requests. SEE ALSO
systemd(1), utmp(5), auditd(8) systemd 208 SYSTEMD-UPDATE-UTMP.SERVICE(8)

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RUNLEVEL(8)                                                          runlevel                                                          RUNLEVEL(8)

NAME
runlevel - Print previous and current SysV runlevel SYNOPSIS
runlevel [options...] OVERVIEW
"Runlevels" are an obsolete way to start and stop groups of services used in SysV init. systemd provides a compatibility layer that maps runlevels to targets, and associated binaries like runlevel. Nevertheless, only one runlevel can be "active" at a given time, while systemd can activate multiple targets concurrently, so the mapping to runlevels is confusing and only approximate. Runlevels should not be used in new code, and are mostly useful as a shorthand way to refer the matching systemd targets in kernel boot parameters. Table 1. Mapping between runlevels and systemd targets +---------+-------------------+ |Runlevel | Target | +---------+-------------------+ |0 | poweroff.target | +---------+-------------------+ |1 | rescue.target | +---------+-------------------+ |2, 3, 4 | multi-user.target | +---------+-------------------+ |5 | graphical.target | +---------+-------------------+ |6 | reboot.target | +---------+-------------------+ DESCRIPTION
runlevel prints the previous and current SysV runlevel if they are known. The two runlevel characters are separated by a single space character. If a runlevel cannot be determined, N is printed instead. If neither can be determined, the word "unknown" is printed. Unless overridden in the environment, this will check the utmp database for recent runlevel changes. OPTIONS
The following option is understood: --help Print a short help text and exit. EXIT STATUS
If one or both runlevels could be determined, 0 is returned, a non-zero failure code otherwise. ENVIRONMENT
$RUNLEVEL If $RUNLEVEL is set, runlevel will print this value as current runlevel and ignore utmp. $PREVLEVEL If $PREVLEVEL is set, runlevel will print this value as previous runlevel and ignore utmp. FILES
/run/utmp The utmp database runlevel reads the previous and current runlevel from. SEE ALSO
systemd(1), systemd.target(5), systemctl(1) systemd 237 RUNLEVEL(8)
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