- published: 23 Jan 2012
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Unix (trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, developed in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
Initially intended for use inside the Bell System, AT&T licensed Unix to outside parties from the late 1970s, leading to a variety of both academic and commercial variants of Unix from vendors such as the University of California, Berkeley (BSD), Microsoft (Xenix), IBM (AIX) and Sun Microsystems (Solaris). AT&T finally sold its rights in Unix to Novell in the early 1990s, which then sold its Unix business to the Santa Cruz Operation (SCO) in 1995, but the UNIX trademark passed to the industry standards consortium The Open Group, which allows the use of the mark for certified operating systems compliant with the Single UNIX Specification (SUS). Among these is Apple's OS X, which is the Unix version with the largest installed base as of 2014.
From the power user's or programmer's perspective, Unix systems are characterized by a modular design that is sometimes called the "Unix philosophy", meaning that the operating system provides a set of simple tools that each perform a limited, well-defined function, with a unified filesystem as the main means of communication and a shell scripting and command language to combine the tools to perform complex workflows. Aside from the modular design, Unix also distinguishes itself from its predecessors as the first portable operating system: almost the entire operating system is written in the C programming language that allowed Unix to reach numerous platforms.
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A security vulnerability in the GNU Bourne Again Shell (Bash), the command-line shell used in many Linux and Unix operating systems, could leave systems running those operating systems open to exploitation by specially crafted attacks. “This issue is especially dangerous as there are many possible ways Bash can be called by an application,” a Red Hat security advisory warned. This is an easy test to determine if a Linux or Unix system is vulnerable. To check your system, from a command line, type: env x='() { :;}; echo vulnerable' bash -c "echo bash bug test"
For GIAC GCUX Test Questions and Answers Please Visit: https://www.PassEasily.com/GCUX.htm Exam Section 1 – AIDE Test Questions (Test Coverage 4%) Exam Section 2 - Apache Questions (Test Coverage 7%) Exam Section 3 - Best Practices for Kernel Tuning and Warning Banner Questions (Test Coverage 9%) Exam Section 4 – Boot Test Service Questions (Test Coverage 6%) Exam Section 5 - Chroot() Questions (Test Coverage 3%) Exam Section 6 – DNS - BIND Questions (Test Coverage 6%) Exam Section 7 – DNSSec Test Questions (Test Coverage 8%) Exam Section 8 - Evidence Collection and Preservation Questions (Test Coverage 9%) Exam Section 9 - Forensic Analysis Questions (Test Coverage 5%) Exam Section 10 - Forensic Preparation and Incident Handling Questions (Test Coverage 3%) Exam Secti...
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