[CALUG] Difference between telinit and init

[James Ewing Cottrell 3rd]

Keep in mind that "at" has been historicly broken and that nobody really 
ever used it. It might work in Linux because when somebody rewrote it, 
they may have actually fixed it.

JIM

Jeremy Portzer wrote:
> 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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>>>>>
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>>
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>>
>>
> 
>