распечатать предыдущий и текущий уровень запуска SysV (Print previous and current SysV runlevel)
Имя (Name)
runlevel - Print previous and current SysV runlevel
Синопсис (Synopsis)
runlevel [options...]
Обзор (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 │
└─────────┴───────────────────┘
Описание (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.
Параметры (Options)
The following option is understood:
--help
Print a short help text and exit.
Статус выхода (Exit)
If one or both runlevels could be determined, 0 is returned, a
non-zero failure code otherwise.
Окружение (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.
Файлы (Files)
/run/utmp
The utmp database runlevel reads the previous and current
runlevel from.
Смотри также (See also)
systemd(1), systemd.target(5), systemctl(1)
