Awk - Revision history

Christoph at 21:29, 30 May 2022

2022-05-30T21:29:17Z

Christoph at 10:38, 26 April 2012

2012-04-26T10:38:53Z

Christoph at 17:15, 9 January 2010

2010-01-09T17:15:47Z

Christoph at 23:12, 17 September 2007

2007-09-17T23:12:48Z

Christoph: /* External links */

2007-08-25T00:26:43Z

‎External links

Christoph at 06:20, 6 August 2007

2007-08-06T06:20:00Z

Show changes

Christoph: /* Associative arrays */

2007-08-06T06:02:54Z

‎Associative arrays

Christoph at 06:00, 6 August 2007

2007-08-06T06:00:10Z

Christoph at 04:10, 6 August 2007

2007-08-06T04:10:18Z

Christoph: AWK programming language moved to Awk

2007-08-06T03:51:47Z

AWK programming language moved to Awk

← Older revision		Revision as of 21:29, 30 May 2022
Line 1:		Line 1:
−	'''Awk''' is a general purpose [[:Category:Scripting languages\|scripting language]] that is designed for processing text based data, either in files or data streams. This article will mainly consider the '''GNU Awk''' (aka '''Gawk''') variant.	+	'''Awk''' is a general purpose [[:Category:Scripting languages\|scripting language]] that is designed for processing text based data, either in files or data streams. This article will mainly consider the '''GNU Awk''' (aka '''Gawk''') variant. Note: Awk gets its name from its authors: '''A'''ho, '''W'''einberger, and '''K'''ernighan.

	In the words of its creators,		In the words of its creators,

← Older revision		Revision as of 10:38, 26 April 2012
Line 9:		Line 9:

	see: [[Awk/scripts]] for detailed examples or [[Awk/tips_and_tricks]].		see: [[Awk/scripts]] for detailed examples or [[Awk/tips_and_tricks]].
		+
		+	==Quick tutorial==
		+	''Note: The following was inspired by Cesar A. Murakami.''
		+
		+	===Some Special variables (Input/Output)===
		+
		+	; FS: Input field separator (char or regex)
		+	; RS: Input record separator
		+	; NF: quantity of fields of the current record
		+	; NR: Current input record number
		+	; OFS: Output field separator
		+	; ORS: Output record separator
		+
		+	===Some more special variables (files and match)===
		+
		+	; ARGC: number of parameters passed to awk
		+	; ARGV: the parameters (files)
		+	; FILENAME: the current file being processed
		+	; FNR: record number of FILENAME
		+	; RSTART: starting position of string matched by match() function
		+	; RLENGTH: length of string matched by match() function
		+
		+	===Conditionals===
		+
		+	if (var1 > 2) {
		+	print "greater than 2";
		+	var1 = var1 + 1;
		+	}
		+	if ( var1 in arr )
		+	printf "%d is an array index\n",var1;
		+	else {
		+	arr[var1] = var2;
		+	printf "%d was not an array index\n",var1;
		+	}
		+
		+	===Loops===
		+
		+	for (i=1; i<=10; i++) {
		+	print i;
		+	}
		+	for (i in arr) {
		+	print arr[i];
		+	}
		+	while ( x != 0 ) {
		+	do_something;
		+	print x;
		+	}
		+
		+	===Functions===
		+
		+	function mysum(param1, param2) {
		+	return param1 + param2;
		+	}
		+
		+	===Code Blocks ('PATTERN {ACTION}')===
		+
		+	BEGIN {
		+	# Code to be executed before record processing.
		+	}
		+	/regex/ {
		+	# Code to be executed when $0 contains a substring that are matched by regex.
		+	}
		+	$1 == "XYZ" {
		+	# Code to be executed when the first field is equal to "XYZ".
		+	}
		+	$2 ~ /regex/ {
		+	# Code to be executed when the second field contains a substring that are matched by regex.
		+	}
		+	! PATTERN {
		+	# Code to be executed when PATTERN is not matched / satisfied.
		+	}
		+	PAT1, PAT2 {
		+	# Code to be executed for record range (PAT1 is matched on start record, PAT2 on final, both lines included in the range).
		+	}
		+	{
		+	# Code to be executed for every record.
		+	}
		+	END {
		+	# Code to be executed after record processing.
		+	}

	==Structure of ''Awk'' programs==		==Structure of ''Awk'' programs==

@@ Line 8: / Line 8: @@
 ''Awk'' is an example of a programming language that extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and [[Regular expression|regular expression]]s. The power, terseness, and limitations of ''Awk'' programs and [[sed]] scripts inspired Larry Wall to write [[Perl]].
-  see: [[Awk/scripts]] for detailed examples.
+  see: [[Awk/scripts]] for detailed examples or [[Awk/tips_and_tricks]].
 ==Structure of ''Awk'' programs==

← Older revision		Revision as of 23:12, 17 September 2007
Line 1:		Line 1:
−	'''Awk''' is a general purpose [[:Category:Scripting languages\|scripting language]] that is designed for processing text based data, either in files or data streams.	+	'''Awk''' is a general purpose [[:Category:Scripting languages\|scripting language]] that is designed for processing text based data, either in files or data streams. This article will mainly consider the '''GNU Awk''' (aka '''Gawk''') variant.

	In the words of its creators,		In the words of its creators,

@@ Line 102: / Line 102: @@
 ==External links==
 *[http://www.gnu.org/software/gawk/gawk.html GAWK (GNU Awk) webpage]
 *[[Wikibooks:Programming:AWK]]
 *[http://www.cs.hmc.edu/qref/awk.html Getting started with awk] &mdash; documentation originally written by Andrew M. Ross.

@@ Line 136: / Line 136: @@
+  }
-== Associative arrays ==
+==Associative arrays==
 Awk has built-in, language-level support for associative arrays.
@@ Line 147: / Line 147: @@
 You can also loop through an associated array as follows:
-  for (name in phonebook)
+  for (name in phonebook) {
-−
       print name, " ", phonebook[name]
+  }

@@ Line 8: / Line 8: @@
 Awk is an example of a programming language that extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and [[Regular expression|regular expression]]s. The power, terseness, and limitations of awk programs and [[sed]] scripts inspired Larry Wall to write [[Perl]].
-  see: [[AWK_programming_language/Scripts|awk scripts]] for detailed examples.
+  see: [[Awk/scripts]] for detailed examples.
 == Structure of awk programs ==

@@ Line 1: / Line 1: @@
-'''AWK''' is a general purpose [[:Category:Scripting languages|scripting language]] that is designed for processing text based data, either in files or data streams.
+'''Awk''' is a general purpose [[:Category:Scripting languages|scripting language]] that is designed for processing text based data, either in files or data streams.
 Awk is an example of a programming language that extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and [[Regular expression|regular expression]]s. The power, terseness, and limitations of awk programs and [[sed]] scripts inspired Larry Wall to write [[Perl]].
@@ Line 185: / Line 190: @@
 </pre>
-== Books ==
+==References==
   Book:
   | Title=''The AWK Programming Language''
@@ Line 212: / Line 219: @@
 *[http://www.computer-books.us/awk.php Computer-Books.us] - A collection of Awk books available for free download.
-== External links ==
+==External links==
 *[http://www.gnu.org/software/gawk/gawk.html GAWK (GNU Awk) webpage]
 *[[Wikibooks:Programming:AWK]]

← Older revision	Revision as of 03:51, 6 August 2007
(No difference)