Actually, it sounds a bit like safe mode.

You can have an off day, but you can't have a day off! ---The Art of Fielding
 Sent from my Mac Book Pro 
richr...@gmail.com

On Jan 28, 2013, at 6:51 AM, "Jonathan C. Cohn" <jonc...@cox.net> wrote:

> Overview of Single user mode:
> Think of DOS  in 1984. Or Apple 2  computers.
> 
> More details:
> 
> Single user mode is the mode where UNIX operating systems only have access 
> enabled on the console and have just enough processes running so a sighted 
> person can interact with the computer. If there are additional disk drives, 
> network connections they are not started.  Essentially when the operating 
> system startup gets to the point where daemons are started  it does not start 
> those daemons but instead starts up a UNIX shell.  When  the UNIX shell is 
> exited with command-D, then the rest of the operating system startup will be 
> processed.  It is really only useful for running some specific utilities. In 
> older UNIX systems where it was essential that there be multiple Disk drives 
> present then when one of those essential disks failed automated boot checks 
> the UNIX system would come up in single user mode.  
> 
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