01-12-2015
I don't see any recommendations for learning on a Unix system. You can if you want. It is easy to find and buy an old Solaris servers from eBay. I would recommend the Sun Fire V245 or the Sun Fire T2000. Both should come with a DVD, disk drives and memory. If you don't get everything upfront it can be hard to make the server work.
The downside for Unix is that it can be harder to get new software for Unix and the hardware is mostly RISC based. Although Sun does have Intel based servers. They are just more expensive.
IMHO, I see Unix dying over the next decade. Although there will likely be someone using it. There is a steel mill near where I live that still uses Digital Equipment Corp Alphas and possibly VAXes even though DEC went away in the mid 90's.
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LEARN ABOUT MOJAVE
geteuid32
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, POSIX.1-2008, 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 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 GETUID(2)