Linux (Ubuntu) = Unix (NOT IMPORTANT - NO RUSH) Post: 302711191

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Top Forums UNIX for Dummies Questions & Answers Linux (Ubuntu) = Unix (NOT IMPORTANT - NO RUSH) Post 302711191 by Corona688 on Friday 5th of October 2012 01:33:15 PM

10-05-2012

Registered User

First and foremost, Linux is not UNIX because it says so. The GNU system which Linux is a part of stands for "GNU's Not UNIX". They named GNU that to set it apart from the very expensive commercial UNIX distributions that were dominant at the time.

It's extremely similar. Folders and devices and networking works the same way. Not all the utilities are quite the same, configuration is different, and the kernel's features are still changing as its developers experiment.

On the other hand -- not even all UNIX is alike. It's really not that different.

What do you really need to know about Unix? I'd start with the Bourne shell and the concepts underlying it(directories, files, and so forth). That will be handy no matter where you go in UNIX and LINUX. You can boot an OS in virtualbox, install another hard drive and dual-boot, boot a Linux livecd for an environment that's hard to mess up -- it's a CD, you can't delete something by accident. Lots of ways.

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LEARN ABOUT LINUX

geteuid

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.

       When  a normal program is executed, the effective and real user ID of the process are set to the ID of the user executing the file.  When a
       set ID program is executed the real user ID is set to the calling user and the effective user ID corresponds to the set ID bit on the  file
       being executed.

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().

SEE ALSO

       getresuid(2), setreuid(2), setuid(2), credentials(7)

COLOPHON

       This  page is part of release 3.27 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								    1993-07-23								 GETUID(2)