Awk Programming Language
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|An Awk Tutorial||by Greg Goebel|
|Awk - A Pattern Scanning and Processing Language||by Alfred V. Aho, Peter J. Weinberger, Brian W. Kernighan|
|The Awk Manual||by Piet van Oostrum|
|Gawk - Effective Awk Programming||Free Software Foundation|
|AWK is a general
purpose programming language that is designed for processing text-based
data, either in files or data streams. The name AWK is derived from the
surnames of its authors — Alfred Aho, Peter Weinberger, and
Brian Kernighan; however, it is commonly pronounced "awk" and not as a
string of separate letters. awk, when written in all lowercase letters,
refers to the Unix or Plan 9 program that runs other programs written
in the AWK programming language.
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 expressions. The power, terseness, and limitations of AWK programs and sed scripts inspired Larry Wall to write Perl. Because of their dense notation, all these languages are often used for writing one-liner programs.
AWK is one of the early tools to appear in Version 7 Unix and gained popularity as a way to add computational features to a Unix pipeline. A version of the AWK language is a standard feature of nearly every modern Unix-like operating system available today. AWK is mentioned in the Single UNIX Specification as one of the mandatory utilities of a Unix operating system. Besides the Bourne shell, AWK is the only other scripting language available in a standard Unix environment. Implementations of AWK exist as installed software for almost all other operating systems.