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| There are several implementation of '''`awk(1)`''': | There are several implementations: |
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| A better example is extracting the hostnames from the [[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(1)` script executable, use `#! /bin/awk -f` as the shebang line. |
Awk
awk(1) is a scripting language designed for text processing.
There are several implementations:
Brian Kernighan open-sourced the original Unix implementation
GNU awk (or gawk) is an extended implementation
BusyBox implements POSIX awk(1)
the modern revivalist GoAWK
See the GNU awk User Manual for further documentation.
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(1) script executable, use #! /bin/awk -f as the shebang line.