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Whatis
In computing, is a command to search the man page files in Unix and Unix-like operating systems. Apropos takes its name from the French "à propos" (Latin "ad prōpositum") which means ''about''. It is particularly useful when searching for commands without knowing their exact names. Behavior Often a wrapper for the command, the apropos command is used to search the "name" sections of all manual pages for the string/s (called keyword/s) specified. The output is a list of all manual pages containing the search term in their name or description. This is often useful if one knows the action that is desired, but does not remember the exact command or page name. apropos search is case insensitive. usually searches in a precompiled database that is shared with , a command for obtaining the brief description of a specific command whose exact name is already known. Sample usage The following example demonstrates the output of the command: $ apropos mount free (1) - D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unix
Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others. Initially intended for use inside the Bell System, AT&T licensed Unix to outside parties in the late 1970s, leading to a variety of both academic and commercial Unix variants from vendors including University of California, Berkeley (Berkeley Software Distribution, BSD), Microsoft (Xenix), Sun Microsystems (SunOS/Solaris (operating system), Solaris), Hewlett-Packard, HP/Hewlett Packard Enterprise, HPE (HP-UX), and IBM (IBM AIX, AIX). In the early 1990s, AT&T sold its rights in Unix to Novell, which then sold the UNIX trademark to The Open Group, an industry consortium founded in 1996. The Open Group allows the use of the mark for certified operating systems that comply with the Single UNIX Specification (SUS). Unix systems are chara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unix-like
A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, although not necessarily conforming to or being certified to any version of the Single UNIX Specification. A Unix-like application is one that behaves like the corresponding Unix command or shell. Although there are general philosophies for Unix design, there is no technical standard defining the term, and opinions can differ about the degree to which a particular operating system or application is Unix-like. Some well-known examples of Unix-like operating systems include Linux and BSD. These systems are often used on servers, as well as on personal computers and other devices. Many popular applications, such as the Apache web server and the Bash shell, are also designed to be used on Unix-like systems. One of the key features of Unix-like systems is their ability to support multiple users and processes simultaneously. This allows users to run multipl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Command (computing)
In computing, a command is a directive to a computer program to perform a specific task. It may be issued via a command-line interface, such as a shell, or as input to a network service as part of a network protocol, or as an event in a graphical user interface triggered by the user selecting an option in a menu. Specifically, the term ''command'' is used in imperative computer languages. The name arises because statements in these languages are usually written in a manner similar to the imperative mood used in many natural languages. If one views a statement in an imperative language as being like a sentence in a natural language, then a command is generally like a verb in such a language. Many programs allow specially formatted arguments, known as flags or options, which modify the default behaviour of the program, while further arguments may provide objects, such as files, to act on. As an analogy to a natural language, the flags are adverbs, while the other arguments are o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computing
Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and experimentation of algorithmic processes, and development of both hardware and software. Computing has scientific, engineering, mathematical, technological and social aspects. Major computing disciplines include computer engineering, computer science, cybersecurity, data science, information systems, information technology and software engineering. The term "computing" is also synonymous with counting and calculating. In earlier times, it was used in reference to the action performed by mechanical computing machines, and before that, to human computers. History The history of computing is longer than the history of computing hardware and includes the history of methods intended for pen and paper (or for chalk and slate) with or without the aid of tables. Computing is intimately tied to the representation of numbers, though mathematical conc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Man Page
A man page (short for manual page) is a form of software documentation usually found on a Unix or Unix-like operating system. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts. A user may invoke a man page by issuing the man command. By default, man typically uses a terminal pager program such as more or less to display its output. Man pages are often referred to as an ''on-line'' or ''online'' form of software documentation, * even though the man command does not require internet access, dating back to the times when printed ''out-of-band'' manuals were the norm. History In the first two years of the history of Unix, no documentation existed. The Unix Programmer's Manual' was first published on November 3, 1971. The first actual man pages were written by Dennis Ritchie and Ken Thompson at the insistence of their manager Doug McIlroy in 1971. Aside from the man pages, the ''Programmer' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
à Propos
À, à ( a-grave) is a letter of the Catalan, Emilian-Romagnol, French, Galician, Italian, Maltese, Occitan, Portuguese, Sardinian, Scottish Gaelic, Vietnamese, and Welsh languages consisting of the letter A of the ISO basic Latin alphabet and a grave accent. À is also used in Pinyin transliteration. In most languages, it represents the vowel ''a''. This letter is also a letter in Taos to indicate a mid tone. When denoting quantity, à means "each": "5 apples à $1" (one dollar each). That usage is based upon the French preposition à and has evolved into the at sign (@). Sometimes, it is part of a surname: Thomas à Kempis, Mary Anne à Beckett. Usage in various languages Emilian-Romagnol À is used in Emilian to represent short stressed e.g. Bolognese dialect ''sacàtt'' aˈkatː"sack". French À is used in the French language to differentiate homophones, e.g. the third person conjugation of ''a'' " e/she/ithas" and ''à'' "at, in, and to". Portuguese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mandoc
mandoc (historically called mdocml) is a utility used for formatting man pages in BSD Operating Systems (e.g. NetBSD), specifically those written in the ''mdoc'' and ''man'' macro languages. Unlike the groff and older troff and nroff tools that are predominantly used for this purpose by tools such as , mandoc focuses specifically on manuals and is not suitable for general-purpose type-setting. is mainly used to format the ''mdoc'' manuals used in the BSD Operating Systems, but it also implements most of the ''man'' macros used in Linux distributions, as well as a subset of roff commands occasionally intermixed with the ''man'' macros. It does not support other macro sets such as ''mm'' and ''ms'', or any typesetting features like hyphenation, fonts and alignment. Simple styling such as bold and italics are supported, but italicized text is replaced by underlined text on the terminal. mandoc has built-in support for the troff soelim (inclusion) preprocessor and partial built ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2BSD
The History of the Berkeley Software Distribution begins in the 1970s. 1BSD (PDP-11) The earliest distributions of Unix from Bell Labs in the 1970s included the source code to the operating system, allowing researchers at universities to modify and extend Unix. The operating system arrived at Berkeley in 1974, at the request of computer science professor Bob Fabry who had been on the program committee for the Symposium on Operating Systems Principles where Unix was first presented. A PDP-11/45 was bought to run the system, but for budgetary reasons, this machine was shared with the mathematics and statistics groups at Berkeley, who used RSTS, so that Unix only ran on the machine eight hours per day (sometimes during the day, sometimes during the night). A larger PDP-11/70 was installed at Berkeley the following year, using money from the Ingres database project. Also in 1975, Ken Thompson took a sabbatical from Bell Labs and came to Berkeley as a visiting professor. He helped to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linux Distribution
A Linux distribution (often abbreviated as distro) is an operating system made from a software collection that includes the Linux kernel and, often, a package management system. Linux users usually obtain their operating system by downloading one of the Linux distributions, which are available for a wide variety of systems ranging from embedded devices (for example, OpenWrt) and personal computers (for example, Linux Mint) to powerful supercomputers (for example, Rocks Cluster Distribution). A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System, or, more recently, Wayland), a window manager, and a desktop environment. Most of the included software is free and open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Usually, Linux distributions optionally include some proprietary so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berkeley DB
Berkeley DB (BDB) is an unmaintained embedded database software library for key/value data, historically significant in open source software. Berkeley DB is written in C with API bindings for many other programming languages. BDB stores arbitrary key/data pairs as byte arrays, and supports multiple data items for a single key. Berkeley DB is not a relational database, although it has advanced database features including database transactions, multiversion concurrency control and write-ahead logging. BDB runs on a wide variety of operating systems including most Unix-like and Windows systems, and real-time operating systems. BDB was commercially supported and developed by Sleepycat Software from 1996 to 2006. Sleepycat Software was acquired by Oracle Corporation in February 2006, who continued to develop and sell the C Berkeley DB library. In 2013 Oracle re-licensed BDB under the AGPL license. As of 2022 Oracle has ceased to develop BDB. Bloomberg LP continues to develop a f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Man Page
A man page (short for manual page) is a form of software documentation usually found on a Unix or Unix-like operating system. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts. A user may invoke a man page by issuing the man command. By default, man typically uses a terminal pager program such as more or less to display its output. Man pages are often referred to as an ''on-line'' or ''online'' form of software documentation, * even though the man command does not require internet access, dating back to the times when printed ''out-of-band'' manuals were the norm. History In the first two years of the history of Unix, no documentation existed. The Unix Programmer's Manual' was first published on November 3, 1971. The first actual man pages were written by Dennis Ritchie and Ken Thompson at the insistence of their manager Doug McIlroy in 1971. Aside from the man pages, the ''Programmer' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whatis
In computing, is a command to search the man page files in Unix and Unix-like operating systems. Apropos takes its name from the French "à propos" (Latin "ad prōpositum") which means ''about''. It is particularly useful when searching for commands without knowing their exact names. Behavior Often a wrapper for the command, the apropos command is used to search the "name" sections of all manual pages for the string/s (called keyword/s) specified. The output is a list of all manual pages containing the search term in their name or description. This is often useful if one knows the action that is desired, but does not remember the exact command or page name. apropos search is case insensitive. usually searches in a precompiled database that is shared with , a command for obtaining the brief description of a specific command whose exact name is already known. Sample usage The following example demonstrates the output of the command: $ apropos mount free (1) - D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
