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Re: root user of cygwin

> On a traditional Unix system, a root user is one with uid=0
> (uid is an abbreviation of user id).
> On an MS-Windows NT family system (NT, 2000, XP), an administrative
> account is one in the group Administrators.
> I'm no expert (rather a novice in many ways with cygwin), but
> I suspect that the upper concept maps probably to the lower
> concept on cygwin.
> The files /etc/passwd and /etc/group should reveal how the
> cygwin (Unix-style) user names and group names map back
> to the MS-Windows NT family SIDs. As MS-Windows implements
> many of the underlying operations, it is the SIDs in
> question that will govern much of what happens.
> (SID = security descriptor number -- actually I forget
> exactly what it abbreviates -- but it is a unique
> number on your machine identifying a user, or a group.)
> There are some documents about ntsec and these matters
> (although I myself have trouble following them).

Documentation is available on the Cygwin home page <>. And
also if you have installed the cygwin-doc package.

User's Guide:
API Referrence:

Oh, and if you get lost by all of the AFAEOTML* (Acronyms Found Alomst
Everywhere On The Mailing Lists :::-):


> Hope that this tidbit above might possibly help a little.
> If opaque, it at least should provide keyword fodder for
> web searches :)

* Don't worry, Igor ;-)


Elfyn McBratney
elfyn at exposure dot org dot uk

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