The widely used term flavors of UNIX refers to the many Unix-like operating systems that have been developed based on the original UNIX that was written in 1969 by Ken Thompson at Bell Labs.
UNIX OS Flavors
Among the ways in which the various flavors of UNIX differ are (1) fundamental design, (2) commands and features, (3) the hardware platform(s) (i.e., processors) for which they are intended and (4) whether they are proprietary software (i.e., commercial software) or free software (i.e., software that anyone can obtain at no cost and use for any desired purpose).
What saved the Unix-like operating systems as a whole (but not the proprietary UNIXs) was the rapid maturation during the latter half of the 1990s of a new flavor -- Linux. This clone (i.e., a similar and compatible system but with all-original source code) overcame the disadvantages of the proprietary flavors by offering (1) very low cost (i.e., free), (2) the ability to operate on a wide range of platforms (everything from a supercomputer to a wristwatch), (3) the availability of the source code so that it could be easily and freely modified and improved by its users and (4) greater ease of use. This was all accomplished without sacrificing any of the power or stability that characterizes Unix-like operating systems.
The growth of Linux so far has been mainly at the expense of the proprietary flavors. However, there is widespread expectation that Linux will increasingly cut into the territory of the Microsoft operating systems as (1) its usability steadily improves, (2) businesses and other organizations become more familiar with its advantages and (3) more systems administrators become available for it.
It should be emphasized that Microsoft Windows is likewise not a single operating system, but rather a family of very different, often mutually incompatible, operating systems despite the superficial similarities. So perhaps they should likewise be referred to as flavors of Windows.
Unix is not a single operating system. It is in fact a general name given to dozens of o.s. by different companies, organizations or groups of individuals. These variants of unix are referred to as flavors. Although based on the same core set of unix commands, different flavors can have their own unique commands and features, and are designed to work with different types of h/w. Linux is often considered a unix flavor.
Among the ways in which the various flavors of UNIX differ are (1) fundamental design, (2) commands and features, (3) the hardware platform(s) (i.e., processors) for which they are intended and (4) whether they are proprietary software (i.e., commercial software) or free software (i.e., software that anyone can obtain at no cost and use for any desiredpurpose).
Microcomputer Unix became commercially available in 1980, when Onyx Systems released its Zilog Z8000-based C8002[12] and Microsoft announced its first Unix for 16-bit microcomputers called Xenix, which the Santa Cruz Operation (SCO) ported to the 8086 processor in 1983. Other companies began to offer commercial versions of Unix for their own minicomputers and workstations. Many of these new Unix flavors were developed from the System V base under a license from AT&T; others were based on BSD. One of the leading developers of BSD, Bill Joy, went on to co-found Sun Microsystems in 1982 and created SunOS for its workstations.
The Unix operating system was created at Bell Labs in 1969. Today, it rules the world. Both Android and iOS are flavors of Unix. So is MacOS. So is GNU/Linux in all its flavors, like Ubuntu and Debian. So is Chrome OS. Virtually every "smart" gadget you own is running some flavor of Unix, from the no-name programmable Christmas lights you put up in December to the smart light-bulb and smart-speaker in your living room.
But there are some circumstances where UNIX is the obvious choice, or used to be. If an enterprise used massive symmetric multiprocessing systems, or systems with more than eight CPUs, they needed to run UNIX in the past. UNIX was far more capable in handling all the processes more effectively than Linux. However since 2004 more of the world's biggest supercomputers now run Linux than unix. Since 2011 Linux powers over 90% of the top 500 servers.
The listed Unix-based operating systems created a strong foundation for the modernized improvements of the operating systems we are currently enjoying. From this list, we now have stable OS distributions and flavors running the technological industry.
When thinking about the future of Unix, it's important to consider a bit of history, as well as current market dynamics. Look at different flavors of Unix -- Linux and Solaris, for example. They complement one another but address different markets.
Linux, and Linux on the x86 architecture in particular, will make inroads into the Windows market. With the ability to run several different flavors of Unix on an inexpensive x86 system, the option to run the prohibitively expensive Windows platform becomes significantly less attractive. We believe we'll see this transition happen slowly, as companies realize that the availability of Unix on x86 means they can get an easier-to-manage system with better uptime and performance than was previously available.
UNIX (unix) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, developed starting in the late 60s and early 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
The Basic Regular Expressions or BRE flavor standardizes a flavor similar to the one used by the traditional UNIX grep command. This is pretty much the oldest regular expression flavor still in use today. One thing that sets this flavor apart is that most metacharacters require a backslash to give the metacharacter its flavor. Most other flavors, including POSIX ERE, use a backslash to suppress the meaning of metacharacters. Using a backslash to escape a character that is never a metacharacter is an error.
A BRE supports POSIX bracket expressions, which are similar to character classes in other regex flavors, with a few special features. Shorthands are not supported. Other features using the usual metacharacters are the dot to match any character except a line break, the caret and dollar to match the start and end of the string, and the star to repeat the token zero or more times. To match any of these characters literally, escape them with a backslash.
The developers of egrep did not try to maintain compatibility with grep, creating a separate tool instead. Thus egrep, and POSIX ERE, add additional metacharacters without backslashes. You can use backslashes to suppress the meaning of all metacharacters, just like in modern regex flavors. Escaping a character that is not a metacharacter is an error.
In the tutorial topic about alternation, I explained that the regex engine will stop as soon as it finds a matching alternative. The POSIX standard, however, mandates that the longest match be returned. When applying SetSetValue to SetValue, a POSIX-compliant regex engine will match SetValue entirely. Even if the engine is a regex-directed NFA engine, POSIX requires that it simulates DFA text-directed matching by trying all alternatives, and returning the longest match, in this case SetValue. A traditional NFA engine would match Set, as do all other regex flavors discussed on this website.
It's amazing that in 2010 there is still confusion over this, but the answer is short and easy: Linux is a UNIX system, like other flavors of UNIX systems, such as Solaris, HP-UX, AIX, IRIX, BSD, Ultrix, and SCO.
Basically, "in the beginning" (the year 1970, that is, which is "The Beginning" as far as UNIX systems are concerned), the very first flavor of UNIX was made at AT&T. Since there were no other flavors at this time, UNIX was simply UNIX. That was all there was to it. Since the first flavor of UNIX other than this original didn't come out until another ten years later, it stayed in this simple state for a whole decade.
UNIX is an Operating System(OS). Operating systems is a software that makes a computerusable, by managing the hardware, other software and automated tasks that are neededfor the computer to work. Windows, MacOS, Android,Chrome OS and Ubuntu are some examples ofoperating systems. There are different flavors of UNIX and except Windows all the otherexamples above are flavors of UNIX. Versions of Windows 10 and newer has support toexecuting UNIX commands as well. In short if you are not on a old version of Windows,you already have access to a program that can execute the UNIX command that is usedto connect to the remote machine as described in this lessons.
Most of the operating system flavors one of the following two methods will bring up thedefault terminal. Do not worry if if the default terminal do not support all bashcommands, as we will use the default terminal only to establish connection to theremote HPC system where we shall execute the other commands described in this lesson.
Debian and Ubuntu are flavors of distributions. Distributions are everything that run ON/AROUND the kernel. And since the kernel cannot do stuff, you'll need some basic applications, to lift Linux to be a fully operating system. So some basic needs a distribution provides is:
Mac OS/X is similar to Unix in that it uses a different kernel (Mach) that is also Unix compatible with a set of software packages on top of that to make it compatible (mostly) with BSD-flavors of Unix. A lot of software is easy to port from Linux to Mac because of Mac's BSD compatibility. However, they change the upper layers of the OS with a GUI based on display PDF and other additions. The whole thing was originally created as NeXT Step and Apple bought it and gave it a facelift. Its in the Unix family.
Of all the security-related incidents that have occurred over the years, more have involved UNIX systems than any other type of operating system. Although UNIX releases have generally improved in security capability over the years, UNIX is still in many respects still the most difficult operating system to secure. Most flavors of UNIX are not very secure out-of-the box, and factors such as UNIX's widespread use in open computing environments compound this problem. Furthermore, the many programs and services (e.g., sendmail, FTP, NFS, and so on) that run in the UNIX environment traditionally have had numerous security-related bugs, many of which have led to root-level compromise. 2ff7e9595c
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