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| There are several implementation of `awk(1)`, the most widely-used being GNU awk (or gawk). Brian Kernighan [[https://github.com/onetrueawk/awk|open-sourced]] the original Unix awk. [[BusyBox]] includes an implementation of POSIX awk. There are several revival/modernization projects, notably [[https://github.com/benhoyt/goawk|GoAWK]] which supports CSV as an input and output format. | There are several implementation of the interpreter program '''`awk(1)`'''. The most widely-used is '''GNU awk''' (or '''gawk'''). Brian Kernighan [[https://github.com/onetrueawk/awk|open-sourced]] the original Unix awk. [[BusyBox]] includes an implementation of awk. There are several revival/modernization projects, notably [[https://github.com/benhoyt/goawk|GoAWK]] which supports CSV as an input and output format. |
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---- == Syntax == * [[Awk/Patterns|Patterns]] * [[Awk/Actions|Actions]] |
Awk
The Awk programming language is a scripting language for operating on text files. It is self-described as being a "data driven" tool; "you describe the data you want to work with and then what to do when you find it".
There are several implementation of the interpreter program awk(1). The most widely-used is GNU awk (or gawk). Brian Kernighan open-sourced the original Unix awk. BusyBox includes an implementation of awk. There are several revival/modernization projects, notably GoAWK which supports CSV as an input and output format.
See the User Manual for more upstream information.
Example
A hello world program isn't helpful for awk, but here's an example anyway.
awk 'BEGIN { print "hello world" }'A better example would involve parsing a hosts file.
awk '/^[^#]/ { print $2 }' /etc/hostsThe awk syntax can be written to a script file and executed like:
awk -f my-hosts-parser.awk /etc/hosts
Shebang
To make an awk script executable, use #! /bin/awk -f as the shebang line.