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Top Forums UNIX for Dummies Questions & Answers Don't hate me because I'm stupid... Post 5721 by spaic on Tuesday 21st of August 2001 11:00:08 AM
Old 08-21-2001
Linux Torvalds from Finland started a small project as a hobby to build a free UNIX compitable OS, At the beginning he called his OS minix.

So this is how the OS wich later got the name Linux started.
You can't say that Linux is UNIX bekause UNIX is a registered trademark of AT&T, and Linux is not UNIX licensed.

There is a big difference between Linux and UNIX, wich is that linux and almost all the software it comes with is OpenSource and licensed under GNU/GPL.

This mean that you have access to the source code and can make any changes you want and redistribuite it, but you can not sell the software.

Linux is OpenSource , UNIX is closed source and in most cases not free for download. But now Sun has made their UNIX os Solaris 8 free for download.
 

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GETUID(2)						     Linux Programmer's Manual							 GETUID(2)

NAME
getuid, geteuid - get user identity SYNOPSIS
#include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void); DESCRIPTION
getuid() returns the real user ID of the calling process. geteuid() returns the effective user ID of the calling process. ERRORS
These functions are always successful. CONFORMING TO
POSIX.1-2001, 4.3BSD. NOTES
History In UNIX V6 the getuid() call returned (euid << 8) + uid. UNIX V7 introduced separate calls getuid() and geteuid(). The original Linux getuid() and geteuid() system calls supported only 16-bit user IDs. Subsequently, Linux 2.4 added getuid32() and geteuid32(), supporting 32-bit IDs. The glibc getuid() and geteuid() wrapper functions transparently deal with the variations across ker- nel versions. SEE ALSO
getresuid(2), setreuid(2), setuid(2), credentials(7) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2010-11-22 GETUID(2)
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