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Old 06-16-2008, 09:34 PM   #1
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chmod 777 and 7777

Dear bros,

May I know what's the difference between 777 and 7777?

I saw the following:
0 drwsrwsrwt 2 admin admin 6 Jun 17 09:29 test

What does the "t" and "s" mean?

thanks bros.
Old 06-16-2008, 10:19 PM   #2
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Try this WIKIPEDIA article on chmod. Check out the Special Modes section and follow the links if you need to. The extra digit is used to set elevated privileges on files. The t is sticky and the s is setuid or setgid. Normal users may be able to do more with a file than they normally could if its set with the fourth digit. I don't think that its used on Linux.
Old 06-16-2008, 11:26 PM   #3
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Hey There,

The 4th bit should be on most Linux and Unix OS's. Usually 777 is really 0777.

Like mentioned aboved the "implied zero" can be set for elevated privileges - 4 = setuid, 2 = setgid and 1 = sticky. They behave differently on files and folders. Probably the only thing that isn't even remotely useful any more is setting the sticky bit (1) on a file. They used to that back in the day to load the program's libraries into resident memory so they would come up quicker the next time they were invoked. Not necessary any more, since having tons of memory, paging, swapping advances, etc have made this pretty much obsolete

Best wishes,

Old 06-17-2008, 11:31 AM   #4
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thanks very much!!!!
Old 06-17-2008, 02:24 PM   #5
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You got it. Glad to help out a bit

Good luck to you and best wishes,



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