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| 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 `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. See the [[https://www.gnu.org/software/gawk/manual/gawk.html|User Manual]] for more upstream information. |
'''`awk(1p)`''' is a scripting language designed for text processing. |
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| A hello world program isn't helpful for awk, but here's an example anyway. |
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| A better example would involve parsing a [[Linux/hosts|hosts file]]. | A more realistic example is extracting hostnames from the [[Linux/Hosts|hosts file]]. |
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| The awk syntax can be written to a script file and executed like: | Execute a script as: |
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| To make an awk script executable, use `#! /bin/awk -f` as the shebang line. | To make an `awk(1p)` script executable, use `#! /bin/awk -f` as the shebang line. ---- == Installation == `awk(1p)` will be installed on all [[Linux]] or [[BSD]] distributions. There are several implementations, some of which are available on additional platforms. * Brian Kernighan [[https://github.com/onetrueawk/awk|open-sourced]] the original Unix implementation * '''GNU awk''' (or '''gawk''') is an extended implementation * [[BusyBox]] * [[https://github.com/benhoyt/goawk|GoAWK]] ---- == Syntax == * [[Awk/Patterns|Patterns]] * [[Awk/Actions|Actions]] ---- == See also == [[https://man.archlinux.org/man/awk.1p|awk(1p)]] [[https://www.gnu.org/software/gawk/manual/gawk.html|GNU awk user manual]] |
Awk
awk(1p) is a scripting language designed for text processing.
Example
awk 'BEGIN { print "hello world" }'A more realistic example is extracting hostnames from the hosts file.
awk '/^[^#]/ { print $2 }' /etc/hostsExecute a script as:
awk -f my-hosts-parser.awk /etc/hosts
Shebang
To make an awk(1p) script executable, use #! /bin/awk -f as the shebang line.
Installation
awk(1p) will be installed on all Linux or BSD distributions.
There are several implementations, some of which are available on additional platforms.
Brian Kernighan open-sourced the original Unix implementation
GNU awk (or gawk) is an extended implementation
Syntax