Category:AWK: Difference between revisions

Execution method:	Interpreted
See Also:	AWK on the HOPL; ;

Content added Content deleted

Inline

Revision as of 04:16, 9 September 2011

AWK is a small but powerful programming language that can process and convert text files. AWK is part of every Unix-derived system, where AWK and UNIX Shell are the only Unix scripting languages that support both numbers and strings.

Each AWK program consists of pattern-action statements. The program reads each input line, checks lines against patterns, and runs matching actions. For programs that never read input lines, the entire program can be one BEGIN { ... } block.

List users who have /bin/ksh as a shell.<lang awk>$ awk -F: '$7 == "/bin/ksh" { print $1 }' /etc/passwd</lang>

AWK has only three types of variables: they are strings, floating-point numbers, and associative arrays (where every array index is a string). Conversion between strings and numbers is automatic. AWK also has regular expressions, which appear in many AWK programs. There are a few built-in functions, like cos() and sprintf().

Find average line length.<lang awk>$ awk '{ cnt += length($0) } END { print cnt / NR }' /etc/rc</lang>

The name "AWK" comes from the initials of Alfred Aho, Peter Weinberger and Brian Kernighan: they invented AWK during the 1970s. A few decades later, Kernighan continues to maintain the reference implementation of AWK.

Links

Subcategories

This category has the following 4 subcategories, out of 4 total.

@

Pages in category "AWK"

The following 200 pages are in this category, out of 709 total.

(previous page) (next page)

1

A

B

C

F

(previous page) (next page)

@@ Line 1: / Line 1: @@
+{{language
-{{wikipedia|AWK}}
+|exec=interpreted
-{{language}}The awk utility is a data extraction and reporting tool that uses a data-driven scripting language consisting of a set of actions to be taken against textual data (either in files or data streams) for the purpose of producing formatted reports.
+|tag=awk
+}}
+AWK is a small but powerful programming language that can process and convert text files. AWK is part of every [[Unix]]-derived system, where AWK and [[UNIX Shell]] are the only Unix scripting languages that support both numbers and strings.
+Each AWK program consists of pattern-action statements. The program reads each input line, checks lines against patterns, and runs matching actions. For programs that never read input lines, the entire program can be one <code>BEGIN { ... }</code> block.
-The language used by awk extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and regular expressions.
+* ''List users who have /bin/ksh as a shell.''<lang awk>$ awk -F: '$7 == "/bin/ksh" { print $1 }' /etc/passwd</lang>
-The reference implementation is still maintained by Brian Kernighan (the "K" in AWK).
+AWK has only three types of variables: they are strings, floating-point numbers, and associative arrays (where every array index is a string). Conversion between strings and numbers is automatic. AWK also has regular expressions, which appear in many AWK programs. There are a few built-in functions, like cos() and sprintf().
-==Citations==
-*[[wp:AWK_%28programming_language%29|Wikipedia:AWK]]
+* ''Find average line length.''<lang awk>$ awk '{ cnt += length($0) } END { print cnt / NR }' /etc/rc</lang>
+The name "AWK" comes from the initials of Alfred Aho, Peter Weinberger and Brian Kernighan: they invented AWK during the 1970s. A few decades later, Kernighan continues to maintain the [[nawk|reference implementation]] of AWK.
+==Links==
+*[http://leaf.dragonflybsd.org/cgi/web-man?command=awk&section=1 awk(1) manual page], short and brief
+*[[wp:AWK (programming language)|AWK in Wikipedia]]
+*[http://awk.info AWK Community Portal]