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The init system is the first daemon to start (during booting) and the last daemon to terminate (during shutdown). Systemd load is a runlevel target to get the system in working condition. Running the command systemctl get-default will show the default target. [21] Historically this was the "SysV init", which was just called "init".
On most systems, all users can check the current runlevel with either the runlevel or who-r command. [12] The root user typically changes the current runlevel by running the telinit or init commands. The /etc/inittab file sets the default runlevel with the :initdefault: entry.
AIX does not follow the System V R4 (SVR4) runlevel specification, with runlevels from 0 to 9 available, as well as from a to c (or h). 0 and 1 are reserved, 2 is the default normal multi-user mode and runlevels from 3 to 9 are free to be defined by the administrator. Runlevels from a to c (or h) allow the execution of processes in that ...
Run a command with a time limit true: Does nothing, but exits successfully tty: Prints terminal name uname: Prints system information unlink: Removes the specified file using the unlink function uptime: Tells how long the system has been running users: Prints the user names of users currently logged into the current host who
systemctl is a command to introspect and control the state of the systemd system and service manager. Not to be confused with sysctl . systemd-analyze may be used to determine system boot-up performance statistics and retrieve other state and tracing information from the system and service manager.
In UNIX or Linux, the sar command is used to check the run queue. The vmstat UNIX or Linux command can also be used to determine the number of processes that are queued to run or waiting to run. These appear in the 'r' column. Example:
launchd has two main tasks. The first is to boot the system, and the second is to load and maintain services.. Here is a simplified view of the Mac OS X Tiger system startup on a PowerPC Mac (on an Intel Mac, EFI replaces Open Firmware and boot.efi replaces BootX):
LILO (Linux Loader) is a bootloader for Linux and was the default boot loader for most Linux distributions [when? Unlike loadlin , it allowed booting Linux without having DOS on the computer. [ 3 ] As of 2009, most distributions have switched to GRUB as the default boot loader. [ 4 ]