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This article draws a parallel between the old SysVinit and the current systemd initialization.

Keep in mind that you can always omit the .service and .target extensions, especially if you're temporarily editing the kernel parameters when bootloader menu shows up. Easier to remember, as well.


SysVinit systemd Information
 rc.d {start | stop | restart} daemon   systemctl {start | stop | restart} daemon.service  Change service state.
 rc.d list   systemctl list-unit-files --type=service  List Services.
 chkconfig daemon {on | off}   systemctl {enable | disable} daemon.service  Turn service on or off.
 chkconfig daemon --add   systemctl daemon-reload  Use when you create or modify configs/scripts.

Targets table

SysV Runlevel systemd Target Notes
0, Halt the system.
1, s, single, Single user mode.
2, 4,, User-defined/Site-specific runlevels. By default, identical to 3.
3, Multi-user, non-graphical. Users can usually login via multiple consoles or via the network.
5, Multi-user, graphical. Usually has all the services of runlevel 3 plus a graphical login.
6, Reboot
emergency Emergency shell