Linux after class Exercise 1

1. What is the relationship between Unix and Linux?
Answer:
difference:
1) UNIX systems are mostly hardware-related, hardware-demanding, and Linux can be run on a variety of hardware platforms.
2) UNIX is a commercial software, the core is not public, and Linux is free software, free, open source code.
3) Installing Linux is easier to master than Unix, and in use, Linux is relatively less complex than UNIX.
4) In performance, Linux is not as comprehensive as UNIX, UNIX and hardware are sold together, mainly for high-end applications or server systems, Linux is used for enterprise or individual
5) Linux is an operating system that looks and performs the same or better than UNIX, but does not originate from UNIX source code, but is a Unix-like product.
Relationship: Unix's history is longer than Linux. Linux is based on UNIX and has all the functions of Unix
same: Unix and Linux are the names of the operating system, but the Unix four letters are the name of the operating system and are owned by SCO as trademarks

2. What is BSD? What do we usually say about FreeBSD, NetBSD, and BSD?
A : BSD is a derivative system of UNIX and is the abbreviation of Berkeley Software distribution. Historically BSD has been considered a UNIX one-"BSD Unix" because it shares the underlying code and design with the-t UNIX operating system. The late BSD version provides a platform for several open source software development and has been in use today. Today, "BSD" is not specifically a BSD derivative version, but a generic term for a branch of a UNIX-like operating system.
FreeBSD, NetBSD is the popular BSD operating system.
FreeBSD always works best on a 32-bit system x86 machine. It works best with PC compatible machines, although FreeBSD can also be run on the Alpha processor and porting to other architectures, but you should think of it as a major operating system for x86 systems. It may also be the easiest to install on any free operating system-especially if you want to install it over the internet instead of buying a CD-ROM, and have a wide range of application software support. FreeBSD is a powerful challenger to Linux, which may provide superior stability, ease of installation and convenience
NetBSD is the most portable operating system based on BSD and currently operates on more than 46 different hardware architectures, and is the best choice for embedded systems.

3. UNIX licenses prohibit the use of UNIX source code in universities which year, followed by the emergence of two important UNIX version of the line, what is the difference?
A: Starting with UNIX version V7 in 1979, UNIX licenses began to prohibit the use of UNIX source code in universities. One is Berkeley's BSD Unix, the other is t/t Unix

4. AIX, Solaris, HP-UX, IRIX which companies have these UNIX developed? Which branch of Unix derivation are they based on (the two version lines in question 3rd)?
A: aix-(Advanced Interactive eXecutive) is a UNIX operating system developed by IBM, based on/t UNIX derivative.
The Unix-like operating system developed by Solaris-sun Company is based on BSD Unix derivative.
hp-ux--, a Unix-like operating system developed by Hewlett-Packard Technology, is based on the UNIX derivative.
irix-Silicon Valley Graphics is a UNIX-based operating system developed on the basis of System V and BSD extension programs, and it derives from BSD Unix.

5. Please explain the concepts of GNU and GPL in the shortest words.
A: GNU: is a free software project, is the abbreviation of GNU's not UNIX, the complete free software system for UNIX upward compatibility, can obtain the source code modification program last release. GNU is a UNIX-like operating system and is free software. More precisely, the Gnu/linux system, which is completely free of software.
GPL: is the abbreviation of general Public License, is the license clause of free software, once the modification follows the GPL's procedure, must circulate according to the GPL standard, and cannot have the author own additional limit. The GPL is licensed to the public: the freedom to run and reproduce software, the freedom to distribute the software, the freedom to obtain the software source code, the freedom to improve the software and the dissemination of the improved version of itself to the community.

6. What are the changes in GPLv2 and GPLV1?
A : The biggest change GPLv2 has made in GPLV1 is the addition of the terms "freedom or death" (Liberty or Death). This article provides that if the software is released from the GPL, it can only be published in binary code, then he will not be entitled to publish the Software at all.

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Linux after class Exercise 1