The Linux System
... A shell script is a file containing a sequence of commands addressed to the operating system that facilitates the repeated execution of the included commands without their having to be laboriously retyped each time they are executed. If there is a distinct ordered list of operating system comman ...
... A shell script is a file containing a sequence of commands addressed to the operating system that facilitates the repeated execution of the included commands without their having to be laboriously retyped each time they are executed. If there is a distinct ordered list of operating system comman ...
What is an operating system?
... Process execution modes in Unix • User mode Processes can access their own instructions and data but not kernel instructions and data Cannot execute certain privileged machine instructions • Kernel mode Processes can access both kernel as well as user instructions and data No limit to which instruc ...
... Process execution modes in Unix • User mode Processes can access their own instructions and data but not kernel instructions and data Cannot execute certain privileged machine instructions • Kernel mode Processes can access both kernel as well as user instructions and data No limit to which instruc ...
Free-Space Management
... address, to minimize disk-head seeks and to write data at times optimized for disk rotation Thus, output to the disk through the file system is often faster than ...
... address, to minimize disk-head seeks and to write data at times optimized for disk rotation Thus, output to the disk through the file system is often faster than ...
Unix hardware level
... • The fundament entity in NTFS is a volume. A volume is created by the NT disk administrator utility, and is based on a logical disk partition. The volume may occupy a portion of a disk, may occupy an entire disk, or may span across several disks. In NTFS, all information about the volume are stored ...
... • The fundament entity in NTFS is a volume. A volume is created by the NT disk administrator utility, and is based on a logical disk partition. The volume may occupy a portion of a disk, may occupy an entire disk, or may span across several disks. In NTFS, all information about the volume are stored ...
Intro to UNIX - Regis University: Academic Web Server for Faculty
... Multi-user, Multi-tasking • More than one user can run at the same time and each user can run more than one task at the same time • In Unix, each program is started as a process. – A process is a program in execution. • Usually only one copy of a program, but there may be many processes running the ...
... Multi-user, Multi-tasking • More than one user can run at the same time and each user can run more than one task at the same time • In Unix, each program is started as a process. – A process is a program in execution. • Usually only one copy of a program, but there may be many processes running the ...
FileSystems
... Levels of structuring None - sequence of words, bytes Simple record structure Lines Fixed length Variable length Complex structures Formatted document Relocatable load file Can simulate last two with first method by inserting appropriate control characters. Need at least execut ...
... Levels of structuring None - sequence of words, bytes Simple record structure Lines Fixed length Variable length Complex structures Formatted document Relocatable load file Can simulate last two with first method by inserting appropriate control characters. Need at least execut ...
Introduction to Linux/Unix
... Redirection and Pipe File/Directory Permissions Process Management The nano Text Editor ...
... Redirection and Pipe File/Directory Permissions Process Management The nano Text Editor ...
Chapter 16 PowerPoint
... Early versions presented a graphical user interface (GUI) for MS-DOS. Microsoft Windows 3.11 was the last 16-bit OS and the most well known version. Microsoft Windows 95 was the first 32-bit version. All applications designed for Windows have standard interfaces. Multitasking allows users to have mo ...
... Early versions presented a graphical user interface (GUI) for MS-DOS. Microsoft Windows 3.11 was the last 16-bit OS and the most well known version. Microsoft Windows 95 was the first 32-bit version. All applications designed for Windows have standard interfaces. Multitasking allows users to have mo ...
Ch. 4 Operating System Fundamentals
... Why Learn About it? • DOS is useful as a troubleshooting aid when Windows will not boot. It allows the hard drive to be accessed without the GUI and provides the ability to run troubleshooting or diagnostic programs. – DOS is a command line operating system, it is not user-friendly – DOS can only ru ...
... Why Learn About it? • DOS is useful as a troubleshooting aid when Windows will not boot. It allows the hard drive to be accessed without the GUI and provides the ability to run troubleshooting or diagnostic programs. – DOS is a command line operating system, it is not user-friendly – DOS can only ru ...
CUSTOMER_CODE SMUDE DIVISION_CODE SMUDE
... There are two types of devices in UNIX- block-oriented devices which transfer data in blocks and character – oriented devices that transfer data on a byte-by – byte basis. ii.Links: A link is a pointer to another file. There are two types of links – ahard link to a file is indistinguishable from the ...
... There are two types of devices in UNIX- block-oriented devices which transfer data in blocks and character – oriented devices that transfer data on a byte-by – byte basis. ii.Links: A link is a pointer to another file. There are two types of links – ahard link to a file is indistinguishable from the ...
Introduction - Faruk Hadziomerovic
... Unix does not allow device to be specified by drive name (like DOS example A: etc.). MOUNT system call inserts I/O device files into any regular directory. I/O devices look like special files kept in /dev directory (example: /dev/lp). ...
... Unix does not allow device to be specified by drive name (like DOS example A: etc.). MOUNT system call inserts I/O device files into any regular directory. I/O devices look like special files kept in /dev directory (example: /dev/lp). ...
CIT 500: IT Fundamentals
... comprehensive and simple machine, ready to use. In this way, the OS provides a virtual machine. ...
... comprehensive and simple machine, ready to use. In this way, the OS provides a virtual machine. ...
Desktop PC Operating Systems
... 3. Go to that cluster and retrieve the data. 4. Go to the FAT table and find the starting cluster and then look up the Pointer Cluster. 5. Go to that cluster and retrieve the data (combining it with previous data for the file). 6. Repeat steps 3 – 5 until a null pointer is found (which indicates the ...
... 3. Go to that cluster and retrieve the data. 4. Go to the FAT table and find the starting cluster and then look up the Pointer Cluster. 5. Go to that cluster and retrieve the data (combining it with previous data for the file). 6. Repeat steps 3 – 5 until a null pointer is found (which indicates the ...
Operating System 10CS53 Executing and Loading User Programs
... Executing and Loading User Programs ...
... Executing and Loading User Programs ...
FAT:
... The FAT file system is relatively straightforward technically and is supported by virtually all existing operating systems for personal computers. This makes it an ideal format for solid-state memory cards and a convenient way to share data between operating systems. The FAT file system was created ...
... The FAT file system is relatively straightforward technically and is supported by virtually all existing operating systems for personal computers. This makes it an ideal format for solid-state memory cards and a convenient way to share data between operating systems. The FAT file system was created ...
390aLecture01_15au
... • shell: An interactive program that uses user input to manage the execution of other programs. A command processor, typically runs in a text window. User types commands, the shell runs the commands Several different shell programs exist: • bash : the default shell program on most Linux/Unix s ...
... • shell: An interactive program that uses user input to manage the execution of other programs. A command processor, typically runs in a text window. User types commands, the shell runs the commands Several different shell programs exist: • bash : the default shell program on most Linux/Unix s ...
390aLecture01_15sp
... • shell: An interactive program that uses user input to manage the execution of other programs. A command processor, typically runs in a text window. User types commands, the shell runs the commands Several different shell programs exist: • bash : the default shell program on most Linux/Unix s ...
... • shell: An interactive program that uses user input to manage the execution of other programs. A command processor, typically runs in a text window. User types commands, the shell runs the commands Several different shell programs exist: • bash : the default shell program on most Linux/Unix s ...
Operating Systems Operating System Component and Structure
... – directory = named file that contains names of other files and metadata about those files (e.g., file size) ...
... – directory = named file that contains names of other files and metadata about those files (e.g., file size) ...
BASIC COMPUTER OPERATION
... RAM = Random Access Memory. The thinking space available to a computer to use while performing operations. The space is emptied out when the computer is turned off. ...
... RAM = Random Access Memory. The thinking space available to a computer to use while performing operations. The space is emptied out when the computer is turned off. ...
OS Components and Structure
... process that handles interpretation of user input commands from keyboard (or script files) on some systems, command interpreter is a standard part of the OS on others, it’s simply a non-privileged process that interfaces to the user, permitting replacement of interpreter with others on others, there ...
... process that handles interpretation of user input commands from keyboard (or script files) on some systems, command interpreter is a standard part of the OS on others, it’s simply a non-privileged process that interfaces to the user, permitting replacement of interpreter with others on others, there ...
document
... writing single characters to system consoles, reading or writing sectors of data from the disks. ...
... writing single characters to system consoles, reading or writing sectors of data from the disks. ...
Unix
... directory tree beginning with the “current directory.” e.g. Suppose I am working in my home directory. I can refer to syllabus.htm as: ...
... directory tree beginning with the “current directory.” e.g. Suppose I am working in my home directory. I can refer to syllabus.htm as: ...
Unix
... directory tree beginning with the “current directory.” e.g. Suppose I am working in my home directory. I can refer to syllabus.htm as: ...
... directory tree beginning with the “current directory.” e.g. Suppose I am working in my home directory. I can refer to syllabus.htm as: ...