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Top Forums UNIX for Dummies Questions & Answers Need your help on permission of /etc/shadow! Post 302543779 by pludi on Tuesday 2nd of August 2011 04:26:27 AM
Old 08-02-2011
The SUID (Set User ID) bit tells the kernel to run a program (not script) using the UID assigned to the file, in this case root. And root always has the permissions to change any file. Which is why SUID binaries should be used only very very rarely, and only if you know what that program is doing.
 

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