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UNIX

UNIX is an operating system consisting of a set of programs which is helpful for the computer in its working. It is a stable, multi-user and multi tasking operating system. It has Graphical User Interface capability ,command language , scripting language.

UNIX OS is composed of 6 components Kernel ,Shell,Programs, Development environment,Commands ,Documentation

System structure of the UNIX operating System mainly consists of three modes which are described below:

  • User Mode: It is further consists of two parts: Applications and Libraries.
  • Kernel Mode: It is also further consists of the following: CPU Scheduling, Virtual Memory, Demand Paging, File System, Signals Terminal etc.
  • Hardware: It is also involves the following: Physical memory, Memory controllers, Disk and tapes etc.

UNIX has involved some approaches like Users, Groups, Permissions and Network-Shared Resources built into its system. This approach is well understood and simple to implement.

  • Users ,Username ,Password ,Default group ,Contact info ,Home directory, Default shell ,Groups ,Permissions ,Network-Shared Resources

A command interpreter that provides the interfaces between Unix Operating system and user is termed as Shell process. It acts as an environment in which a user can run their programs, shell scripts and commands. UNIX shell programming enables user to build their functions and use them when they needed.

Pthreads Synchronization is the advanced concept of UNIX which mainly shared memory, so there is need for synchronization.

Unix File System management utilities, disk management, Berkley Sockets API ,advanced filters, Client/server programming, Standard I/O vs System I/O, System V Interprocess Communication ,Files, Directories, and Printing ,UNIX Shell Environment ,Networking Commands ,UNIX File Information ,Data Backup

A broad ranges of UNIX products include Open Server ,UnixWare ,Open Server 6

Various Distributions of UNIX System include SCO UNIX, Solaris, MINIX, IRIX, Tru64, ULTRIX, Xenix etc.

Several useful features of the UNIX are mentioned below:

  • Multi-user
  • Multi-tasking
  • Hierarchical directory structure
  • Portability

UNIX is an operating system that controls a computer system and its peripherals. Operating system acts as an interface between user and system. Unix is a multi tasking and multi user system which allows user to do more than one task. Unix has consists three main parts: The kernel ,The shell ,The programs.
The kernel is used to allocate the times and memory to programs. The shells acts as an interface between user and system. Unix consists large number of programs according to the user needs. Main characteristics of unix are as follows:

  • Portable
  • Multi tasking
  • Multi user
  • Flexible and reliable
  • Open source
  • Shared libraries

It includes commands such as chgrp, cat, cd, chmod, cp, date, file, find, grep, head, In ,Is , more, pwd, tail, touch, rmdir, rm, mv, mkdir. These all commands are used to handle files and directories. Unix consists everything as a file or process. Process is a program that can be identified by unique process identifier. File is a collection of data. In unix, file system is arranged in hierarchical structure. Collection of file is known as directory. There are three types of files in UNIX that are Directories,Ordinary files andSpecial files

It is best for that situation where lot of power is required for database applications and computing.

In UNIX programming there are many shells such as c shell, Bourne shell and Korn shell which is highly programmable. In UNIX programming shell is the command line interpreter. Shell is the program or a command that interacts with the kernel. Any shell can be run easily by just typing its name.

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Topics for Unix Assignment help :

  • Unix system programming, UNIX Operating System, UNIX File System,VI Editor, Shell and system environment, files, directories, Emacs Editor, UNIX Communication, Program Development, Shell Programming, Open source philosophy , Linux GUI and the terminal , Matrix server ,Common Matrix problems and their solutions ,
  • SSH/SFTP Putty Tunnelier , Unix file system , file system commands, Common file utilities ,File name expansion, Shell basics, Quoting  , Hierarchical File system , Pathnames ,Filename Expansion , Data Representation, Unix file permissions ,Access Permissions ,Simple filter commands, grep utility ,Redirection and piping ,
  • Standard Input and Output, Piping , Fedora Linux , Virtualization, Linux system administration, VirtualBox , CentOS DVD ISO , Filesystem links , Hard and symbolic links ,Storage quota information (quota) , Regular expressions , Literal matching , Character classes , wildcard repetition symbol , Anchoring ,
  • Shell start-up files , Shell Scripting , Shell Variables , Positional Parameters , echo and read commands ,if and test statements , for loop ,Extended Regular Expressions, Process control and signals,Multi-threading, Unix internals, Memory management, I/O system, Device drivers, Socket interface, Streams interfaceUNIX commands, UNIX file attributes, UNIX program,

 

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Help for complex Unix Homework help topics like:

  • Process operation, performance measurement, system software and application software, Command line interface, UNIX disk organization and directory structure,  directory commands, file recovery within Emacs, shell redirection, filename substitution characters, computer applications,
  • Unix Commands, Processing & Listing, Processes and Directories, Directories, Wildcards, File Creation and Displaying, Transliteration, Head and Tail command in files, Files Handling, GREP and EGREP, EGREP Meta character, Back Referencing,Using POSIX commands, ZIP & TAR, FIND command, 
  • Shell, echo, Expr, Test, read Header files of shell script ,Command Substitution, Assigning global value , Export Command Line Arguments, Conditional & Looping Statement,CASE, Functions, Advanced Commands, Advanced Shell Scripting, Extracting data from HTML/XML file, Trapping Signals,
  • Database Connectivity, UNIX shell ,  shell variables,  Meta characters,  UNIX utilities, UNIX Email, Programming languages, UNIX shell programming, internals of UNIX, terminals and terminal applications, menu driven application, disk space, Additional UNIX commands, UNIX spelling correction,
  • UNIX security, file transfer protocol,UNIX Standards ,Processes ,Process Management ,Files and Directories ,System I/O ,System Interprocess Communication ,Pipe and Signal, Concurrent Programming with Processes and Threads ,Sockets and TCP Clients

 

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