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Broadly speaking, a UNIX system is layered according to applications that are invoked through user shells, which are managed by a kernel which in turn uses file systems to create a persistent storage mechanism. Since the kernel provides the interface between shells and the file system (and by extension, between applications and the file system), it is considered the central part of UNIX technology. Solaris kernels can trace their origins to both the System V and BSD variants of UNIX, while Microsoft Windows NT was based on the Virtual Memory System (VMS) kernel originally developed for the high-end VAX systems. Most kernels during the 1960s were written using assembly language or machine (binary) code, so the development of a high-level language for writing kernels (the C language) was one of the founding ideas of UNIX. This level of abstraction from hardware meant that kernels could be ported to other hardware platforms without having to be completely rewritten. The tradition of writing kernels in C continues today, with the Linux kernel (for example) being written in C. Obviously, a kernel alone is not a complete operating environment, so many additional applications (such as the visual editor, vi) were later added to what UNIX users would recognize as the suite of standard UNIX tools. All UNIX systems have a kernel, which is the central logical processor that provides an interface between the system hardware, the system services, and the user shells that directly enable applications. For example, support for network interfaces is provided in the form of a kernel module and a device file that logically represents the physical device. Services are defined in the services database, and network daemons provide the final layer for supporting applications that use the network to transmit data. Since UNIX kernels are typically written in the C programming language, many systems-level applications and daemons are also written in C. Of course, UNIX systems share some common characteristics with other operating systems, including the use of a hierarchical file system in which special files called directories are used to arrange related files logically. But UNIX has some distinctive
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features as well: explicit permissions to read, execute, and modify files on the UNIX file system can be granted to specific users or groups of users, making it easy to share work and collaborate with other users on the system.
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A key Solaris concept is the functional separation between the user interface and the operating system. This distinction means that a user can access a Solaris system by using either a terminal-based character user interface (CUI) or a high-resolution GUI without modifying the underlying operating system. With so much attention paid to GUIs, why are CUI environments still important to Solaris Are they just a historical hangover that Windows has managed to overcome Are they simply the tools of choice for long-haired network administrators who have never used a mouse In fact, mastering the Solaris command line is one of the most effective tools available under any UNIX environment, and the good news is that it s not that difficult to learn. Using the command line (or shell) has several advantages over GUI environments. The shell is essential for programming repetitive tasks that can be performed only laboriously through a GUI. For example, searching a file system for all document files that have changed each day and making a copy of all these files (with the extension .doc) to a backup directory (with the extension .bak) takes time. The shell can be used to search for, modify, edit, and replace Solaris configuration files, which are typically storied in text format. This is much like the approach taken with Windows .ini configuration files, which were text-based. However, after Windows 95, Windows versions store configuration information in the Registry in a binary format, making it impossible to edit manually. Most Solaris configuration files, including the startup scripts, are text based, and there is a move in many applications to standardize around XML. The shell has a number of built-in commands that typically mirror those provided in the C programming language. This means that it is possible to write small programs as shell statements that are executed as sequential steps, without having to use a compiler (just like MS-DOS batch files are interpreted without requiring a compiler). The shell can be used to launch applications that use a CUI, which is especially useful for logging onto a remote system and enabling access to the commands an administrator can use on the console, a valuable point in this era of global information systems. While Windows applications like Symantec s pcAnywhere can be used for remote access to the Windows Desktop, they don t easily support multiuser access (or multiuser access where one user requires a CUI and another a GUI). The shell can be used to execute commands for which no equivalent GUI application exists. Although many operations could conceivably be performed using a GUI, it is usually easier to write a shell script than to create a completely new GUI application. Many applications in Solaris, Linux, and Windows are now available through a GUI. If you feel more comfortable using GUIs, there is little reason to stop using them as long as you can find the tools to perform all of the tasks you need to undertake regularly, such as monitoring resource usage, setting process alarms and diagnostics, and/or facilitating
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