Category:AWK: Difference between revisions

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

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Revision as of 19:29, 16 October 2014

AWK is a small but powerful programming language that can process and convert text files. AWK is part of every Unix-derived system.

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.

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@@ Line 2: / Line 2: @@
 |exec=interpreted
 |tag=awk
+}}{{CompileOnline}}
-}}
 AWK is a small but powerful programming language that can process and convert text files. AWK is part of every [[Unix]]-derived system.
-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.
+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.
 * ''List users who have /bin/ksh as a shell.''<lang awk>$ awk -F: '$7 == "/bin/ksh" { print $1 }' /etc/passwd</lang>
-AWK has only three types of variables: they are strings, floating-point numbers, and associative arrays (where every array index is a string). Conversion between strings and numbers is automatic. AWK also has regular expressions, which appear in many AWK programs. There are a few built-in functions, like cos() and sprintf().
+AWK has only three types of variables: they are strings, floating-point numbers, and associative arrays (where every array index is a string).
+Conversion between strings and numbers is automatic. AWK also has regular expressions, which appear in many AWK programs.
+There are a few built-in functions, like cos() and sprintf().
 * ''Find average line length.''<lang awk>$ 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 [[nawk|reference implementation]] of AWK.
+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==