{"product_id":"sed-awk-unix-power-tools-9781565922259","title":"sed \u0026 awk: UNIX Power Tools","description":"\u003cp\u003e\u003ci\u003esed \u0026amp; awk\u003c\/i\u003e describes two text processing programs that are mainstays of the UNIX programmer's toolbox.\u003ci\u003esed\u003c\/i\u003e 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 \u003ci\u003esed\u003c\/i\u003e is substitution, replacing one block of text with another.\u003ci\u003eawk\u003c\/i\u003e is a complete programming language. Unlike many conventional languages, \u003ci\u003eawk\u003c\/i\u003e is \"data driven\" -- you specify what kind of data you are interested in and the operations to be performed when that data is found. \u003ci\u003eawk\u003c\/i\u003e 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 \u003ci\u003eawk\u003c\/i\u003e provides the features of most conventional programming languages, it also includes some unconventional features, such as extended regular expression matching and associative arrays. \u003ci\u003esed \u0026amp; awk\u003c\/i\u003e describes both programs in detail and includes a chapter of example \u003ci\u003esed\u003c\/i\u003e and \u003ci\u003eawk\u003c\/i\u003e scripts.This edition covers features of \u003ci\u003esed\u003c\/i\u003e and \u003ci\u003eawk\u003c\/i\u003e that are mandated by the POSIX standard. This most notably affects \u003ci\u003eawk\u003c\/i\u003e, where POSIX standardized a new variable, CONVFMT, and new functions, \u003ci\u003etoupper\u003c\/i\u003e() and \u003ci\u003etolower\u003c\/i\u003e(). The CONVFMT variable specifies the conversion format to use when converting numbers to strings (\u003ci\u003eawk\u003c\/i\u003e used to use OFMT for this purpose). The \u003ci\u003etoupper\u003c\/i\u003e() and \u003ci\u003etolower\u003c\/i\u003e() 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 \u003ci\u003esed\u003c\/i\u003e, newly available since the first edition. It also updates the first edition coverage of Bell Labs \u003ci\u003enawk\u003c\/i\u003e and GNU \u003ci\u003eawk\u003c\/i\u003e (\u003ci\u003egawk\u003c\/i\u003e), covers \u003ci\u003emawk\u003c\/i\u003e, an additional freely available implementation of \u003ci\u003eawk\u003c\/i\u003e, and briefly discusses three commercial versions of \u003ci\u003eawk\u003c\/i\u003e, MKS \u003ci\u003eawk\u003c\/i\u003e, Thompson Automation \u003ci\u003eawk\u003c\/i\u003e (\u003ci\u003etawk\u003c\/i\u003e), and Videosoft (VSAwk).\u003c\/p\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAbout the Author\u003c\/b\u003e\u003cbr\u003e\u003cp\u003eDale Dougherty is the publisher of the O'Reilly Network and Director of O'Reilly Research. Dale has been instrumental in many of O'Reilly's most important efforts, including founding O'Reilly \u0026amp; Associates with Tim O'Reilly. He was the developer and publisher of Global Network Navigator (GNN), the first commercial Web site. Dale was developer and publisher of Web Review, the online magazine for Web designers, and he was O'Reilly \u0026amp; Associates' first editor. Dale has written and edited numerous books at O'Reilly \u0026amp; Associates. Dougherty is a Lecturer in the School of Information Management and Systems (SIMS) at the University of California at Berkeley.\u003c\/p\u003e\u003cp\u003eArnold Robbins, an Atlanta native, is a professional programmer and technical author. He has worked with Unix systems since 1980, when he was introduced to a PDP-11 running a version of Sixth Edition Unix. He has been a heavy AWK user since 1987, when he became involved with gawk, the GNU project's version of AWK. As a member of the POSIX 1003.2 balloting group, he helped shape the POSIX standard for AWK. He is currently the maintainer of gawk and its documentation. He is also coauthor of the sixth edition of O'Reilly's Learning the vi Editor. Since late 1997, he and his family have been living happily in Israel.\u003c\/p\u003e\u003cbr\u003e","brand":"O'Reilly Media","offers":[{"title":"Default Title","offer_id":50473827303698,"sku":"9781565922259","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/4771\/8930\/files\/img_42bbaffa-82ae-47de-8ea0-6d7da6afc2e5.jpg?v=1730204056","url":"https:\/\/surprise-castle.myshopify.com\/products\/sed-awk-unix-power-tools-9781565922259","provider":"Surprise Castle","version":"1.0","type":"link"}