uname -a output

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Old 07-19-2011
Every Linux on the planet is GNU/Linux (as far as I knowSmilie) This particular distribution seems to be Red Hat Enterprise Linux 5 (.el5 in the output of uname -a). As for the books, there are plenty of various books taking the subject of Linux administration. I would suggest first going for some basic book covering Linux fundamentals, like managing files, working with the shell etc. After that you can move to something more specific, maybe something about administering RHEL5, so you can practice on your server. It is important to know that Linux comes in many different distributions, so books covering one might be not very accurate for another.
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uname(2)							System Calls Manual							  uname(2)

uname - Gets the name of the current system SYNOPSIS
#include <sys/utsname.h> int uname( struct utsname *name); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: uname(): XSH5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Points to a utsname structure. DESCRIPTION
The uname() function stores information identifying the current system in the structure pointed to by the name parameter. The uname() function uses the utsname structure, which is defined in the sys/utsname.h file and contains the following members: char sys- name[_SYS_NMLN]; char nodename[_SYS_NMLN]; char release[_SYS_NMLN]; char version[_SYS_NMLN]; char machine[_SYS_NMLN]; The uname() function returns a null-terminated character string naming the current system in the sysname character array. The nodename array contains the name that the system is known by on a communications network. The release and version arrays further identify the sys- tem. The machine array identifies the CPU hardware being used. RETURN VALUES
Upon successful completion, a nonnegative value is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
If the uname() function fails, errno may be set to the following value: [Tru64 UNIX] The name parameter points outside of the process address space. RELATED INFORMATION
Commands: uname(1) Standards: standards(5) delim off uname(2)