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TBL2
Part of the troff suite of Unix document layout tools, tbl is a preprocessor that formats tables in preparation for processing with troff/nroff. Overview Mike Lesk is the original author of tbl. Like the main troff program, it uses command lines interspersed with data to be printed. Because of the nature of tabular data having rows and columns, tbl commands also intraline delimiters for fields and to indicate where to draw lines. First a line starting with .TS, followed by full table options such as center to center the table on a line or box to draw a box around it (boxes in tbl are drawn with overlapping hyphens and underscores; there were no line drawing commands at the time of creation. Disjoint edges can be observed upon close inspection). Succeeding lines set up the formatting of each cell in the table with one character flags, such as c to center data in its cell, hyphens to draw horizontal rules, vertical bars to draw vertical rules, and carets to span cells verticall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mike Lesk
Michael E. Lesk (born 1945) is an American computer scientist. Biography In the 1960s, Michael Lesk worked for the SMART Information Retrieval System project, wrote much of its retrieval code and did many of the retrieval experiments, as well as obtaining a BA degree in Physics and Chemistry from Harvard College in 1964 and a PhD from Harvard University in Chemical Physics in 1969. From 1970 to 1984, Lesk worked at Bell Labs in the group that built Unix. Lesk wrote Unix tools for word processing (''tbl'', ''Refer (software), refer'', and the standard ''ms'' macro package, all for ''troff''), for compiling (''Lex (software), Lex''), and for networking (''uucp''). He also wrote the Portable I/O Library (the predecessor to stdio.h in C (programming language), C) and contributed significantly to the development of the C (programming language), C language preprocessor. In 1984, he left to work for Bellcore, where he managed the computer science research group. There, Lesk worked on s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hyphen
The hyphen is a punctuation mark used to join words and to separate syllables of a single word. The use of hyphens is called hyphenation. ''Son-in-law'' is an example of a hyphenated word. The hyphen is sometimes confused with dashes (figure dash , en dash , em dash , Horizontal bar (punctuation), horizontal bar ), which are longer and have different uses, or with the minus sign , which is also longer and more vertically centred in some typefaces. Although hyphens are not to be confused with en dashes, there are some overlaps in #Use in English, usage (in which either a hyphen or an en dash may be acceptable, depending on user preference, as #En dash, hyphen, or either one, discussed below). In addition, the hyphen often substitutes for the en dash elsewhere in informal writing. As an Orthography, orthographic concept, the hyphen is a single entity. In terms of character encoding and display, it is represented by any of several character (computing), characters and glyphs, inc ... [...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 bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groff (software)
Groff ( ) (also called GNU troff) is a typesetting system that creates formatted output when given plain text mixed with formatting commands. It is the GNU replacement for the troff and nroff text formatters. Groff contains a large number of helper programs, preprocessors, and postprocessors including eqn, tbl, pic and soelim. There are also several macro packages included that duplicate, expand on the capabilities of, or outright replace the standard troff macro packages. Groff development of new features is active, and is an important part of free, open source, and UNIX derived operating systems such as Linux and 4.4BSD derivatives — notably because troff macros are used to create man pages, the standard form of documentation on Unix and Unix-like systems. OpenBSD has replaced groff with mandoc in the base install, since their 4.9 release. Also macOS Ventura. History groff is an original implementation written primarily in C++ by James Clark and is modeled aft ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tab Character
The tab key (abbreviation of tabulator key or tabular key) on a keyboard is used to advance the cursor to the next tab stop. History The word ''tab'' derives from the word ''tabulate'', which means "to arrange data in a tabular, or table, form." When a person wanted to type a table (of numbers or text) on a typewriter, there was a lot of time-consuming and repetitive use of the space bar and backspace key. To simplify this, a horizontal bar was placed in the mechanism called the tabulator rack. Pressing the tab key would advance the carriage to the next tabulator stop. The original tabulator stops were adjustable clips that could be arranged by the user on the tabulator rack. Fredric Hillard filed a patent application for such a mechanism in 1900. The tab mechanism came into its own as a rapid and consistent way of uniformly indenting the first line of each paragraph. Often a first tab stop at 5 or 6 characters was used for this, far larger than the indentation used when t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Full Stop
The full stop (Commonwealth English), period (North American English), or full point , is a punctuation mark. It is used for several purposes, most often to mark the end of a declarative sentence (as distinguished from a question or exclamation). This sentence-ending use, alone, defines the strictest sense of ''full stop''. Although ''full stop'' technically applies only when the mark is used to end a sentence, the distinction – drawn since at least 1897 – is not maintained by all modern style guides and dictionaries. The mark is also used, singly, to indicate omitted characters or, in a series, as an ellipsis (), to indicate omitted words. It may be placed after an initial letter used to stand for a name or after each individual letter in an initialism or acronym (e.g., "U.S.A."). However, the use of full stops after letters in an initialism or acronym is declining, and many of these without punctuation have become accepted norms (e.g., "UK" and "NATO"). This trend has pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caret
Caret is the name used familiarly for the character , provided on most QWERTY keyboards by typing . The symbol has a variety of uses in programming and mathematics. The name "caret" arose from its visual similarity to the original proofreader's caret, a mark used in proofreading to indicate where a punctuation mark, word, or phrase should be inserted into a document. The formal ASCII standard (X3.64.1977) calls it a "circumflex". History Typewriters On typewriters designed for languages that routinely use diacritics (accent marks), there are two possible ways to type these. Keys can be dedicated to precomposed characters (with the diacritic included) or alternatively a dead key mechanism can be provided. With the latter, a mark is made when a dead key is typed but, unlike normal keys, the paper carriage does not move on and thus the next letter to be typed is printed under the accent. The symbol was originally provided in typewriters and computer printers so that circumfl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertical Bar
The vertical bar, , is a glyph with various uses in mathematics, computing, and typography. It has many names, often related to particular meanings: Sheffer stroke (in logic), pipe, bar, or (literally the word "or"), vbar, and others. Usage Mathematics The vertical bar is used as a mathematical symbol in numerous ways: * absolute value: , x, , read "the ''absolute value'' of ''x''" * cardinality: , S, , read "the ''cardinality'' of the set ''S''" * conditional probability: P(X, Y), reads "the probability of ''X'' ''given'' ''Y''" * determinant: , A, , read "the ''determinant'' of the matrix ''A''". When the matrix entries are written out, the determinant is denoted by surrounding the matrix entries by vertical bars instead of the usual brackets or parentheses of the matrix, as in \begin a & b \\ c & d\end. * distance: P, ab, denoting the shortest ''distance'' between point P to line ab, so line P, ab is perpendicular to line ab * divisibility: a \mid b, read "''a'' ''divides'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Data
In the pursuit of knowledge, data (; ) is a collection of discrete values that convey information, describing quantity, quality, fact, statistics, other basic units of meaning, or simply sequences of symbols that may be further interpreted. A datum is an individual value in a collection of data. Data is usually organized into structures such as tables that provide additional context and meaning, and which may themselves be used as data in larger structures. Data may be used as variables in a computational process. Data may represent abstract ideas or concrete measurements. Data is commonly used in scientific research, economics, and in virtually every other form of human organizational activity. Examples of data sets include price indices (such as consumer price index), unemployment rates, literacy rates, and census data. In this context, data represents the raw facts and figures which can be used in such a manner in order to capture the useful information out of it. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AT&T Bell Laboratories
Nokia Bell Labs, originally named Bell Telephone Laboratories (1925–1984), then AT&T Bell Laboratories (1984–1996) and Bell Labs Innovations (1996–2007), is an American industrial research and scientific development company owned by multinational company Nokia. With headquarters located in Murray Hill, New Jersey, the company operates several laboratories in the United States and around the world. Researchers working at Bell Laboratories are credited with the development of radio astronomy, the transistor, the laser, the photovoltaic cell, the charge-coupled device (CCD), information theory, the Unix operating system, and the programming languages B, C, C++, S, SNOBOL, AWK, AMPL, and others. Nine Nobel Prizes have been awarded for work completed at Bell Laboratories. Bell Labs had its origin in the complex corporate organization of the Bell System telephone conglomerate. In the late 19th century, the laboratory began as the Western Electric Engineering Department, l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nroff
nroff (short for "new roff") is a text-formatting program on Unix and Unix-like operating systems. It produces output suitable for simple fixed-width printers and terminal windows. It is an integral part of the Unix help system, being used to format man pages for display. nroff and the related troff were both developed from the original roff. While nroff was intended to produce output on terminals and line printers, troff was intended to produce output on typesetting systems. Both used the same underlying markup and a single source file could normally be used by nroff or troff without change. History nroff was written by Joe Ossanna for Version 2 Unix, in Assembly language and then ported to C. It was a descendant of the RUNOFF program from CTSS, the first computerized text-formatting program, and is a predecessor of the Unix troff document processing system. There is also a free software version of nroff in the groff package. Variants The Minix operating system, among ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Table (information)
A table is an arrangement of information or data, typically in rows and columns, or possibly in a more complex structure. Tables are widely used in communication, research, and data analysis. Tables appear in print media, handwritten notes, computer software, architectural ornamentation, traffic signs, and many other places. The precise conventions and terminology for describing tables vary depending on the context. Further, tables differ significantly in variety, structure, flexibility, notation, representation and use. Information or data conveyed in table form is said to be in tabular format (adjective). In books and technical articles, tables are typically presented apart from the main text in numbered and captioned floating blocks. Basic description A table consists of an ordered arrangement of rows and columns. This is a simplified description of the most basic kind of table. Certain considerations follow from this simplified description: * the term row has several c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
