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In the system was rewritten in the programming language C, an unusual step that was visionary: Other innovations were added to Unix as well, in part due to synergies between Bell Labs and the academic community. After this point, the history of Unix becomes somewhat convoluted.
After many years each variant adopted many of the key features of the other. However, System V ended up incorporating many BSD innovations, so the resulting system was more a merger of the two branches.
The BSD branch did not die, but instead became widely used for research, for PC hardware, and for single-purpose servers e. The result was many different versions of Unix, all based on the original seventh edition. Most versions of Unix were proprietary and maintained by their respective hardware vendor, for example, Sun Solaris is a variant of System V.
Three versions of the BSD branch of Unix ended up as open source: More general information about Unix history can be found at http: The Unix Heritage Society refers to several sources of Unix history. By free, Stallman meant software that could be freely used, read, modified, and redistributed.
The FSF successfully built a vast number of useful components, including a C compiler gccan impressive text editor emacsand a host of fundamental tools. In the Linux community, different organizations have combined the available components differently.
There are differences between the various distributions, but all distributions are based on the same foundation: This book is not specific to any Linux distribution; when it discusses Linux it presumes Linux kernel version 2.
Eric Raymond [, ] wrote several seminal articles examining its various development processes. For information on this definition of free software, and the motivations behind it, can be found at http: Those interested in reading advocacy pieces for open source software and free software should see http: There are other documents which examine such software, for example, Miller  found that the open source software were noticeably more reliable than proprietary software using their measurement technique, which measured resistance to crashing due to random input.
Linux is not derived from Unix source code, but its interfaces are intentionally like Unix. Therefore, Unix lessons learned generally apply to both, including information on security. Most of the information in this book applies to any Unix-like system. Unix-like systems share a number of security mechanisms, though there are subtle differences and not all systems have all mechanisms available.
All include user and group ids uids and gids for each process and a filesystem with read, write, and execute permissions for user, group, and other. See Thompson  and Bach  for general information on Unix systems, including their basic security mechanisms.
Chapter 3 summarizes key security features of Unix and Linux. You could also look at a general textbook on computer security, such as [Pfleeger ].
A few security principles are summarized here. Often computer security objectives or goals are described in terms of three overall objectives: Integrity, meaning that the assets can only be modified or deleted by authorized parties in authorized ways.
Availability, meaning that the assets are accessible to the authorized parties in a timely manner as determined by the systems requirements. The failure to meet this goal is called a denial of service. Some people define additional major security objectives, while others lump those additional goals as special cases of these three.
Privacy is sometimes addressed separately from confidentiality; some define this as protecting the confidentiality of a user e. Most objectives require identification and authentication, which is sometimes listed as a separate objective. Often auditing also called accountability is identified as a desirable security objective.
For example, The U. This includes providing for restoration of information systems by incorporating protection, detection, and reaction capabilities.Today we’re pleased to introduce Wazo , the latest iteration in the Wazo fork of XiVO. Twelve years in the making with the same development team, Wazo is really something special.
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