GAWK: Effective AWK Programming

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282 GAWK: Effective AWK ProgrammingmawkawkaCompressed tar filehttp://www.cs.princeton.edu/~bwk/btl.mirror/awk.tar.gzZip filehttp://www.cs.princeton.edu/~bwk/btl.mirror/awk.zipThis version requires an ISO C (1990 standard) compiler; the C compiler fromGCC (the GNU Compiler Collection) works quite nicely.See Section A.4 [Extensions in the Bell Laboratories awk], page 259, for a listof extensions in this awk that are not in POSIX awk.Michael Brennan has written an independent implementation of awk, calledmawk. It is available under the GPL (see [GNU General Public License],page 316), just as gawk is.The original distribution site for the mawk source code no longer has it. A copyhas been made available at http://www.skeeve.com/gawk/mawk1.3.3.tar.gz.In 2009, Thomas Dickey took on mawk maintenance. Basic informationis availabe on the project’s web page. The download URL isftp://invisible-island.net/mawk/mawk.tar.gz.Once you have it, gunzip may be used to decompress this file. Installationis similar to gawk’s (see Section B.2 [Compiling and Installing gawk on Unix],page 268).mawk has the following extensions that are not in POSIX awk:• The fflush built-in function for flushing buffered output (see Section 8.1.4[Input/Output Functions], page 143).• The ‘**’ and ‘**=’ operators (see Section 5.5 [Arithmetic Operators],page 81 and also see Section 5.7 [Assignment Expressions], page 83).• The use of func as an abbreviation for function (see Section 8.2.1 [FunctionDefinition Syntax], page 153).• The ‘\x’ escape sequence (see Section 2.2 [Escape Sequences], page 25).• The ‘/dev/stdout’, and ‘/dev/stderr’ special files (see Section 4.7 [SpecialFile Names in gawk], page 69). Use "-" instead of "/dev/stdin" withmawk.• The ability for FS and for the third argument to split to be null strings(see Section 3.5.2 [Making Each Character a Separate Field], page 45).• The ability to delete all of an array at once with ‘delete array’ (seeSection 7.6 [The delete Statement], page 123).• The ability for RS to be a regexp (see Section 3.1 [How Input Is Split intoRecords], page 36).• The BINMODE special variable for non-Unix operating systems (seeSection B.3.1.4 [Using gawk on PC Operating Systems], page 273).• The nextfile statement (see Section 6.4.9 [Using gawk’s nextfile Statement],page 109).Written by Andrew Sumner, awka translates awk programs into C, compilesthem, and links them with a library of functions that provides the core awkfunctionality. It also has a number of extensions.
Appendix B: Installing gawk 283pawkThe awk translator is released under the GPL, and the library is under theLGPL.To get awka, go to http://awka.sourceforge.net. You can reach AndrewSumner at andrew@zbcom.net.Nelson H.F. Beebe at the University of Utah has modified the Bell Labsawk to provide timing and profiling information. It is different from pgawk(see Section 10.5 [Profiling Your awk Programs], page 173), in that ituses CPU-based profiling, not line-count profiling. You may find it ateither ftp://ftp.math.utah.edu/pub/pawk/pawk-20030606.tar.gz orhttp://www.math.utah.edu/pub/pawk/pawk-20030606.tar.gz.The OpenSolaris POSIX awkThe version of awk in ‘/usr/xpg4/bin’ on Solaris is POSIX compliant. It isbased on the awk from Mortice Kern Systems for PCs. The source code can bedownloaded from the OpenSolaris web site. This author was able to make itcompile and work under GNU/Linux with 1–2 hours of work. Making it moregenerally portable (using GNU Autoconf and/or Automake) would take morework, and this has not been done, at least to our knowledge.jawkQTawkThis is an interpreter for awk written in Java. It claims to be a full interpreter,although because it uses Java facilities for I/O and for regexp matching, thelanguage it supports is different from POSIX awk. More information is availableon the project’s home page.This is an independent implementation of awk distributed under the GPL. Ithas a large number of extensions over standard awk and may not be 100%syntactically compatible with it. See http://www.quiktrim.org/QTawk.htmlfor more information, including the manual and a download link.QSE Awk This is an embeddable awk interpreter. For more information seehttp://code.google.com/p/qse/ and http://awk.info/?tools/qse.
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