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49 Cards in this Set
- Front
- Back
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A powerful computer operating system originally developed by AT&T Bell Laboratories
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Unix
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Open, modular system, flexible command line
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Unix
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Powerful multitasking, multiuser, virtual memory opearting system that runs on a wide variety of hardware platforms
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Unix
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Technical innovations of the Unix operating system
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Flexibility, Multitasking, Multi-user, portability
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Five components of Unix
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Kernel, shell, processes, system utilities, and file system
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The core of the unix os
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Kernel
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Kernel Functions:
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Memory management, file system management, error handling, input and output, resource allocation
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The portion of the unix os which acts as the interface between users and the kernel
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Shell
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Common shell types:
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Bourne Shell, C Shell, Korn Shell
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Became the de facto standard
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Bourne Shell
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Syntax is modeled after the C programming language and is used primarily for interactive terminal use, but less frequently for scripting and os control
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C shell
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Backwards-compatible with the Bourne shell and includes many features of the Cshell such as a command history.
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Korn Shell
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Any actively executing program or command
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Active process
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Small, independent programs that are usually narrow in scope that provides a single capability or a single area of functionality
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System utilities
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Requires discussion, establishes rules for file names and the directory structure
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File system
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Four types of file types:
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Directory, device files, link files, regular files
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A file that exists to provide order and organization to the file structure
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Directory
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Each piece of hardware is considered a file
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Device file
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Shortcuts like gui
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Link files
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Store information in either ASCII text or Binary format
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Regular Files
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Case sensitive, can be hundreds of characters long
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File names
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Organized in hat looksl ike an upside down tree structure
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Directory structure
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Types of directories
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Root, home, current, parent/child
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The start of the directory structure
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Root directory
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Where the os places us when we start unix
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Home directory
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AKA courrent working directory, the directory the user is currently accessing
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Current directory
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Above the current directory or below the current directory
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Parent/child
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Two types of pathnames:
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Absolute or relative
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Always start from the root directory
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Absolute pathnames
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Provide a mechanism for specifying the location of a file within a directory, without beginning from the root directory
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Relative pathnames
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Case sensitive, can be hundreds of characters long
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File names
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Organized in hat looksl ike an upside down tree structure
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Directory structure
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Types of directories
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Root, home, current, parent/child
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The start of the directory structure
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Root directory
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Where the os places us when we start unix
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Home directory
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AKA courrent working directory, the directory the user is currently accessing
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Current directory
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Above the current directory or below the current directory
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Parent/child
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Two types of pathnames:
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Absolute or relative
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Always start from the root directory
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Absolute pathnames
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Provide a mechanism for specifying the location of a file within a directory, without beginning from the root directory
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Relative pathnames
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Three categories of users:
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File owner, group, others
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The person who created a file
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Owner
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A collection of users who share areas of responsibility and work together as a team
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Group
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Anyone other than the file owner or those in the file's group
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Others
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Four types of permissions:
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Read, write, execute or none
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All file types can have any of the four mentioned permissions assigned to them
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File permissions
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Use the same permissions of files, but apply to directories
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Directory Permissions
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To types of os installation
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Initial and upgrade
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Either loads the os for the first time or overwrites the previous version with the new version
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Initial installation
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