Linux
... • /usr : Programs and data that can be shared across many systems and don't need to be changed. • /var : Data that changes constantly (log files that contain information about what's happening on your system, data on its way to the printer, and so on). ...
... • /usr : Programs and data that can be shared across many systems and don't need to be changed. • /var : Data that changes constantly (log files that contain information about what's happening on your system, data on its way to the printer, and so on). ...
notes - University of Arizona Computer Science
... Inherited from the parent Shell can control the file descriptors of its children (redirection) This is a very powerful feature of UNIX, as it means the shell can make a process read/write different things without modifying the program, e.g. files, devices, another process. ...
... Inherited from the parent Shell can control the file descriptors of its children (redirection) This is a very powerful feature of UNIX, as it means the shell can make a process read/write different things without modifying the program, e.g. files, devices, another process. ...
Chorusamoeba
... 80 single-board SPARC computers connected by an Ethernet, forming a powerful processor pool. [Amoeba 1996 ] ...
... 80 single-board SPARC computers connected by an Ethernet, forming a powerful processor pool. [Amoeba 1996 ] ...
Ch. 14 : UNIX Operating System with Linux
... Dynamic libraries are loaded only when they’re needed & their code is shared if several applications are using them. Linux allows file partitions used by file systems such as Ext2 and partitions having other formats (MS-DOS, ISO 9660, etc.) It supports TCP/IP and other network protocols. ...
... Dynamic libraries are loaded only when they’re needed & their code is shared if several applications are using them. Linux allows file partitions used by file systems such as Ext2 and partitions having other formats (MS-DOS, ISO 9660, etc.) It supports TCP/IP and other network protocols. ...
UNICOS, FORTRAN 90, NQS
... • Shells - A shell provides an interface between the user and the kernel. The shell interprets commands and command options entered at the command-line prompt and initiates the appropriate actions in the kernel. – UNICOS supports two shells: • The Korn shell (default) • The C shell ...
... • Shells - A shell provides an interface between the user and the kernel. The shell interprets commands and command options entered at the command-line prompt and initiates the appropriate actions in the kernel. – UNICOS supports two shells: • The Korn shell (default) • The C shell ...
ppt - Purdue University :: Computer Science
... library, string library, window library, c library etc. It has to do all of the above in a secure and reliable manner. ...
... library, string library, window library, c library etc. It has to do all of the above in a secure and reliable manner. ...
file (1.5 MB, ppt)
... owner: rw-, group: r--, others: r- r: read, w: write, x: execute When a process executes, it has four values related ...
... owner: rw-, group: r--, others: r- r: read, w: write, x: execute When a process executes, it has four values related ...
Chorusamoeba
... on different projects. The machines need not be of the same type, and may be spread around a building on a LAN. ...
... on different projects. The machines need not be of the same type, and may be spread around a building on a LAN. ...
Quick History of Open Source
... History of Unix • Unix can run on almost all computers (mainframes, supercomputers, PC's, to hand-held computers, a different flavor for each one). • The 'real' Unix (System V) from AT&T might cost you $1500 for one copy and will only run on limited hardware (if they still sell it!!). • Current day ...
... History of Unix • Unix can run on almost all computers (mainframes, supercomputers, PC's, to hand-held computers, a different flavor for each one). • The 'real' Unix (System V) from AT&T might cost you $1500 for one copy and will only run on limited hardware (if they still sell it!!). • Current day ...
FILE
... First part of this course introduces students to the Linux programming. Most Linux manuals are very cryptic and hence needs a gentle introduction. Students will be introduced to the basic knowledge about (not necessarily all the commands themselves) Linux commands, system calls, library and scripts ...
... First part of this course introduces students to the Linux programming. Most Linux manuals are very cryptic and hence needs a gentle introduction. Students will be introduced to the basic knowledge about (not necessarily all the commands themselves) Linux commands, system calls, library and scripts ...
Ch1 Introduction to the Linux Kernel
... The kernel typically resides in an elevated system state compared to normal user applications This includes a protected memory space and full access to the hardware This system state and memory space is collectively referred to as kernel-space ...
... The kernel typically resides in an elevated system state compared to normal user applications This includes a protected memory space and full access to the hardware This system state and memory space is collectively referred to as kernel-space ...
Operating system components Operating system
... people tired of bloat of UNIX are happy with GNU/Linux best ideas of UNIX are found in GNU/Linux much of the implementation is written correctly developers have had the time to write code correctly it also uses a name change UNIX to GNU/Linux ...
... people tired of bloat of UNIX are happy with GNU/Linux best ideas of UNIX are found in GNU/Linux much of the implementation is written correctly developers have had the time to write code correctly it also uses a name change UNIX to GNU/Linux ...
Norman Matloff, Unix Processes
... A process is an instance of running a program. If, for example, three people are running the same program simultaneously, there are three processes there, not just one. In fact, we might have more than one process running even with only person executing the program, because (you will see later) the ...
... A process is an instance of running a program. If, for example, three people are running the same program simultaneously, there are three processes there, not just one. In fact, we might have more than one process running even with only person executing the program, because (you will see later) the ...
BAB 8 SISTEM PENGOPERASIAN
... brands, including Base, Workstation and Server. First UNIX 98 registered products shipped by Sun, IBM and NCR. The Open Source movement starts to take off with announcements from Netscape and IBM. UnixWare 7 and IRIX 6.5 ship.1999UNIX at 30The UNIX system reaches its 30th anniversary. Linux 2.2 kern ...
... brands, including Base, Workstation and Server. First UNIX 98 registered products shipped by Sun, IBM and NCR. The Open Source movement starts to take off with announcements from Netscape and IBM. UnixWare 7 and IRIX 6.5 ship.1999UNIX at 30The UNIX system reaches its 30th anniversary. Linux 2.2 kern ...
Unix File System
... In addition to the classic Data Encryption Standard (DES), there is an advanced symmetric-key encryption algorithm AES (Advanced Encryption Standard). The AES-128, AES-192 and AES-256 use a 128-bit block size, with key sizes of 128, 192 and 256 bits, respectively Most linux systems use Hash Function ...
... In addition to the classic Data Encryption Standard (DES), there is an advanced symmetric-key encryption algorithm AES (Advanced Encryption Standard). The AES-128, AES-192 and AES-256 use a 128-bit block size, with key sizes of 128, 192 and 256 bits, respectively Most linux systems use Hash Function ...
The Evolution of the Unix Time-sharing System
... Addition of a fork call that copied the current process to the disk swap area, using the already existing swap IO primitives, and made some adjustments to the process table. ...
... Addition of a fork call that copied the current process to the disk swap area, using the already existing swap IO primitives, and made some adjustments to the process table. ...
The Evolution of the Unix Time
... existing swap IO primitives, and made some adjustments to the process table. ...
... existing swap IO primitives, and made some adjustments to the process table. ...
Linux - Spider
... Boot -- contains the kernel and system map Bin -- contains the basic system binaries Dev -- all the device entries Etc -- can't think of any other place to put it Home -- where all the users live Lib -- system libraries Mnt -- place to mount filesystems Proc -- system information Root -- the root us ...
... Boot -- contains the kernel and system map Bin -- contains the basic system binaries Dev -- all the device entries Etc -- can't think of any other place to put it Home -- where all the users live Lib -- system libraries Mnt -- place to mount filesystems Proc -- system information Root -- the root us ...
1. design principle
... the same. First they make computer hardware easier to use. Second the operating systems shares the resources among the different users and effectively manage them. The design of operating system is becoming more modular. The operating systems have evolved in a great way from the earliest Simple batc ...
... the same. First they make computer hardware easier to use. Second the operating systems shares the resources among the different users and effectively manage them. The design of operating system is becoming more modular. The operating systems have evolved in a great way from the earliest Simple batc ...
Processes in Unix, Linux, and Windows
... • PCB is a large data structure that contains or points to all info about the process – Linux - defined in task_struct – over 70 fields • see include/linux/sched.h ...
... • PCB is a large data structure that contains or points to all info about the process – Linux - defined in task_struct – over 70 fields • see include/linux/sched.h ...
Presentación de PowerPoint
... File: collection of bits with a name saved in a physical storage device File system: mecanism to access the file using its symbolic name Directory: data structure that groups a set of files File operations: open, close, read, write, append, ... UNIX file management is implemented using indexed-nodes ...
... File: collection of bits with a name saved in a physical storage device File system: mecanism to access the file using its symbolic name Directory: data structure that groups a set of files File operations: open, close, read, write, append, ... UNIX file management is implemented using indexed-nodes ...
Mach: A System Software Kernel Abstract
... complete and a number of 4.3BSD binaries including the C compiler, tools, editors, shells and socket-based programs such as ftp were functioning. It was expected that the out of kernel BSD implementation would be complete at the time of this conference. The Mach operating system is currently being d ...
... complete and a number of 4.3BSD binaries including the C compiler, tools, editors, shells and socket-based programs such as ftp were functioning. It was expected that the out of kernel BSD implementation would be complete at the time of this conference. The Mach operating system is currently being d ...
UNIX Notes:
... This concept may take a little getting used to before all that is means sets in. To log into a UNIX system your terminal must be described to the system. In the directory /dev the system device files (files that contain the hardware interfacing information UNIX/Linux needs) are contained. In additio ...
... This concept may take a little getting used to before all that is means sets in. To log into a UNIX system your terminal must be described to the system. In the directory /dev the system device files (files that contain the hardware interfacing information UNIX/Linux needs) are contained. In additio ...
Unix time
Unix time (also known as POSIX time or Epoch time) is a system for describing instants in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970, not counting leap seconds. It is used widely in Unix-like and many other operating systems and file formats. Because it does not handle leap seconds, it is neither a linear representation of time nor a true representation of UTC. Unix time may be checked on most Unix systems by typing date +%s on the command line.