[CALUG] Difference between telinit and init

[Jeremy Portzer]

Keep in mind there is a standard command-line tool called "at" that is 
generally used for scheduling a task to occur once in the future.

It's unclear why the authors of init felt they needed to rewrite a feature 
that already exists in tools like "at", but ... this is probably a dead 
horse now :-)

--Jeremy

On Fri, 25 Aug 2006, Gregory Haase wrote:

> init -t appears to work, although that would be an "undocumented
> feature" as far as the man page is concerned.
> 
> I don't understand why your second answer is "better yet" - It looks
> like a CLI hack for solving a problem that already has a viable solution.
> 
> The real true difference between init and telinit is that init always
> carries a PID of 1 whereas telinit will acquire a separate PID as any
> other process in the system. Although I have no idea why this would
> actually matter in the grand scheme of things.
> 
> -G
> 
> James Ewing Cottrell 3rd wrote:
> > And what does "init -t 300 3" do? Better yet, what does "(sleep 300;
> > exec init 3)&" do?
> > 
> > JIM
> > 
> > Gregory Haase wrote:
> >> If you look at the man page for init or telinit (actually the same page
> >> on my machine), you will see that other than including a runlevel after
> >> the command, the two have different switches - specifically, telinit
> >> includes the -t switch which allows you to add a time component to the
> >> command.
> >>
> >> Running init 3 will instantly cause the init process change the runlevel
> >>
> >> Running telinit -t 300 3 will cause the init process to change the
> >> runlevel in 5 minutes.
> >>
> >> -Greg
> >>
> >> James Ewing Cottrell 3rd wrote:
> >>
> >>> Which brings up the question: Why TF does "telinit" exist in the
> >>> first place? What's wrong with simply typing "init 1"? Nothing!
> >>>
> >>> JIM
> >>>
> >>> Gary wrote:
> >>>
> >>>> Hi,
> >>>>
> >>>> I usually accomplish this with the "telinit" command:  "telinit 1"
> >>>>
> >>>> This drops you into runlevel 1, which is single-user mode. 
> >>>> Networking isn't typically enabled in runlevel 1, but you
> >>>> probably don't need it if the NVIDIA driver resides on the
> >>>> local machine.  Depending on the Linux distro, you might
> >>>> also try "telinit 3", which is multi-user command console
> >>>> mode in RedHat and Fedora Core distros.
> >>>> Good Luck,
> >>>>  Gary.
> >>>>
> >>>> Edward D. Browne wrote:
> >>>>
> >>>>
> >>>>
> >>>>> Hmmm, guess I haven't needed to do this since quite a few
> >>>>> releases ago.  I'm trying to upgrade my graphics driver
> >>>>> (to NVIDIA-Linux-x86-1.0-8762-pkg1.run), which means
> >>>>> I have to get out of X.  As I recall, there was always a menu
> >>>>> option at the login screen to log in without X running, but now
> >>>>> with RH AS3, I see no such option.  Killing X, and everything
> >>>>> that looks connected to X, only results in it automatically
> >>>>> restarting.   init 3 or 4 or 5 or 6 (it doesn't seem to matter)
> >>>>> just causes the machine to reboot all the way back to run
> >>>>> level 6.  What obvious solution am I missing?
> >>>>>
> >>>>> TIA - Ed
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> >>>>>
> >>>>
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