WebPOSIX（ポジックス 、英: Portable Operating System Interface ）は、オペレーティングシステム (OS) の標準的なインタフェースおよび環境を定義するIEEE規格である 。 ソースコードレベルでの移植性の高いアプリケーションソフトウェアの開発を容易にすることを目的として、主にUNIX系のOSに関して、各OS ...

WebAWK (awk) is a domain-specific language designed for text processing and typically used as a data extraction and reporting tool. Like sed and grep, it is a filter, and is a standard feature of most Unix-like operating systems.. The AWK language is a data-driven scripting language consisting of a set of actions to be taken against streams of textual data – either run …

WebAlphanumericals or alphanumeric characters are a combination of alphabetical and numerical characters.More specifically, they are the collection of Latin letters and Arabic digits.An alphanumeric code is an identifier made of alphanumeric characters.. Merriam-Webster suggests that the term "alphanumeric" may often additionally refer to other …

WebUnix time is a date and time representation widely used in computing.It measures time by the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the beginning of the Unix epoch.. Unix time originated as the system time of Unix operating systems. It has come to be widely used in other computer operating systems, file …

WebThe command diff original new produces the following normal diff output: . 0a1,6 > This is an important > notice! It should > therefore be located at > the beginning of this > document! > 11,15d16 < This paragraph contains < text that is outdated. < It will be deleted in the < near future. < 17c18 < check this dokument. On--- > check this document. On 24a26,29 > > …

WebIn the late 1980s, an open operating system standardization effort now known as POSIX provided a common baseline for all operating systems; IEEE based POSIX around the common structure of the major competing variants of the Unix system, publishing the first POSIX standard in 1988. In the early 1990s, a separate but very similar effort was started …

WebA regex processor translates a regular expression in the above syntax into an internal representation that can be executed and matched against a string representing the text being searched in. One possible approach is the Thompson's construction algorithm to construct a nondeterministic finite automaton (NFA), which is then made deterministic …

WebIn computer security, an access-control list (ACL) is a list of permissions associated with a system resource (object). An ACL specifies which users or system processes are granted access to objects, as well as what operations are allowed on given objects. Each entry in a typical ACL specifies a subject and an operation. For instance, if a file object has an ACL …

WebThe cron command-line utility is a job scheduler on Unix-like operating systems.Users who set up and maintain software environments use cron to schedule jobs (commands or shell scripts), also known as cron jobs, to run periodically at fixed times, dates, or intervals. It typically automates system maintenance or administration—though its general-purpose …

WebFile locking is a mechanism that restricts access to a computer file, or to a region of a file, by allowing only one user or process to modify or delete it at a specific time and to prevent reading of the file while it's being modified or deleted.. Systems implement locking to prevent the classic interceding update scenario, which is a typical example of a race condition, by …

WebThe Standard Template Library (STL) is a software library originally designed by Alexander Stepanov for the C++ programming language that influenced many parts of the C++ Standard Library.It provides four components called algorithms, containers, functions, and iterators.. The STL provides a set of common classes for C++, such as containers …

WebPOSIX Threads, commonly known as pthreads, is an execution model that exists independently from a language, as well as a parallel execution model. It allows a program to control multiple different flows of work that overlap in time. Each flow of work is referred to as a thread, and creation and control over these flows is achieved by making calls to the …

WebA linear congruential generator (LCG) is an algorithm that yields a sequence of pseudo-randomized numbers calculated with a discontinuous piecewise linear equation.The method represents one of the oldest and best-known pseudorandom number generator algorithms. The theory behind them is relatively easy to understand, and they are easily implemented …

WebOn POSIX-compliant platforms, SIGHUP ("signal hang up") is a signal sent to a process when its controlling terminal is closed. It was originally designed to notify the process of a serial line drop. SIGHUP is a symbolic constant defined in the header file signal.h History. A hangup was often the ...