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Old 12-24-2006, 12:01 PM   #1
Registered: Aug 2003
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Question Standard Run Levels?

Hello! I read somewhere that, for a Sys V Init system using runlevels, that the only reserved run levels are 0, 6, and S. I was hoping if someone could cite (ie. document and page number) this information back to an official document that specifies that these are, in fact, the only reserved run levels. I think I came across the document some time ago, probably the System V Interface Definition ( but upon searching through it a million times I didn't see anything more than runlevels 1-6, and S *exist*. I don't remember what document specifies this! Anyone know?

Also, I was wondering if anyone knows whether the system initialization process is standardized or not (ie. "all UNIX systems require the use of an init program/script). I don't think so but I just want to double check.

Thank You Very Much!
Old 12-24-2006, 12:43 PM   #2
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Here is a link that might help. I think ubuntu starting with 6.10 is using a different system called upstart or something to that effect. Other than that the above link goes over most of the different *nix's.


Last edited by fordeck; 12-24-2006 at 12:45 PM.
Old 12-24-2006, 12:56 PM   #3
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Thanks, I do need something like that. Funny you brought that link up as Wikipedia was my starting point (as it is for everything else) for my little journey here. I need something very similar to the table in the "Standard Run Levels" section, except I need it to come from the official source, ie. the standard or official document that specefies how a Sys V compatible init works. Unfortunately any other documentation (eg. from the SysVInit project) will not do- only from the original documentation.

If there is no standard that outlines the operation of a Sys V Init, then I suppose the next best thing would be the man pages for a Sys V init and /etc/inittab. I would really appreciate any help I can get, it's *somewhat* important that I obtain this citaiton. Thank you very much!


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