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Dale Dougherty, Arnold Robbins/Дейл Дакерти, Арнольд Роббинс - sed & awk, Second Edition [1997, PDF, ENG]

Сообщение Солнышко » 31 янв 2018, 21:24

Dale Dougherty, Arnold Robbins - sed & awk, Second Edition [1997, PDF, ENG]
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Год: 1997
Автор: Dale Dougherty, Arnold Robbins / Дейл Дакерти, Арнольд Роббинс
Издательство: O'Reilly Media
ISBN: 1-56592-225-5
Язык: Английский
Формат: PDF
Качество: Изначально компьютерное (eBook)
Интерактивное оглавление: Да
Количество страниц: 432
Описание: sed & awk describes two text processing programs that are mainstays of the UNIX programmer's toolbox.
sed is a "stream editor" for editing streams of text that might be too large to edit as a single file, or that might be generated on the fly as part of a larger data processing step. The most common operation done with sed is substitution, replacing one block of text with another.
awk is a complete programming language. Unlike many conventional languages, awk is "data driven" -- you specify what kind of data you are interested in and the operations to be performed when that data is found. awk does many things for you, including automatically opening and closing data files, reading records, breaking the records up into fields, and counting the records. While awk provides the features of most conventional programming languages, it also includes some unconventional features, such as extended regular expression matching and associative arrays. sed & awk describes both programs in detail and includes a chapter of example sed and awk scripts.
This edition covers features of sed and awk that are mandated by the POSIX standard. This most notably affects awk, where POSIX standardized a new variable, CONVFMT, and new functions, toupper() and tolower(). The CONVFMT variable specifies the conversion format to use when converting numbers to strings (awk used to use OFMT for this purpose). The toupper() and tolower() functions each take a (presumably mixed case) string argument and return a new version of the string with all letters translated to the corresponding case.
In addition, this edition covers GNU sed, newly available since the first edition. It also updates the first edition coverage of Bell Labs nawk and GNU awk (gawk), covers mawk, an additional freely available implementation of awk, and briefly discusses three commercial versions of awk, MKS awk, Thompson Automation awk (tawk), and Videosoft (VSAwk).
Доп. информация:
Our look is the result of reader comments, our own experimentation, and feedback from distribution channels. Distinctive covers complement our distinctive approach to technical topics, breathing personality and life into potentially dry subjects. The animal featured on the cover of sed & awk is a slender loris. Lorises are nocturnal, tree- dwelling, tailless primates with thick, soft fur and large, round eyes. They are found in Southern India and Ceylon, where they live in trees, rarely descending to the ground. Lorises have been observed urinating on their hands and feetit is thought that they do this to improve their grip while climbing and to leave a scent trail.
A small animal, the slender loris is generally between 7 and 10 inches in size and weighs 12 ounces or less. It subsists on a diet of fruit, leaves, and shoots and small animals that it captures by hand. Edie Freedman designed the cover of this book, using a 19th-century engraving from the Dover Pictorial Archive. The cover layout was produced with Quark XPress 3.3 using the ITC Garamond font.
The inside layout was designed by Nancy Priest and Mary Jane Walsh. Text was prepared in SGML using the DocBook 2.1 DTD. The print version of this book was created by trans- lating the SGML source into a set of gtroff macros using a filter developed at ORA by Norman Walsh. Steve Talbott designed and wrote the underlying macro set on the basis of the GNU troff -gs macros; Lenny Muellner adapted them to SGML and implemented the book design. The GNU groff text formatter version 1.09 was used to generate PostScript output. The text and heading fonts are ITC Garamond Light and Garamond Book; the constant-width font used in this book is Letter Gothic. The illustrations that appear in the book were created in Macromedia Freehand 5.0 by Chris Reilley.

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