from the dept.
As many of you may already know, UNIX is separated into two main camps. The BSD camp and the system V camp. System V Unix OS's have many run levels which they can run in and each level starts up different services. On the other hand, BSD(FreeBSD included) has only two: single-user and multi-user mode. Also, you can switch between these two modes without a reboot. Here's how...
For this to work, you have to start FreeBSD in single-user mode, after that you can switch to multi-user mode and back to singe-user mode without rebooting.
[Boot in single user mode]
As the operating system is starting, it will display the following message:
[Mount the filesystems]
Next, you will have to mount your filesystems manually. At the command prompt, issue the mount command. This command will mount all the filesystems listed in your /etc/fstab file. You may also wish to enable your swap.
[Switch to multi-user mode]
At the command prompt, issue the exit command. This command will run your normal startup scripts and start FreeBSD in multi-user mode.[Switch back to single-user mode]
At the command prompt, issue the shutdown now command. This will not shutdown the computer, but instead will drop you back to single-user mode.
To shutdown the OS in either single-user or multi-user mode, issue the halt command:To learn more about the commands listed in this post please refer to the man pages.
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