awk

The awk utility is a data extraction and reporting tool that uses a data-driven scripting language consisting of a set of actions to be taken against textual data (either in files or data streams) for the purpose of producing formatted reports. The language used by awk extensively uses the string datatype, associative arrays (that is, arrays indexed by key strings), and regular expressions.

• Project Homepage [EN]
• GNU Project Homepage [EN]

• awk [EN] @ Homebrew Formula
• GNU Version [EN] @ Homebrew Formula

• awk [EN] @ Wikipedia
• awk [DE] @ Wikipedia

Documentation

• GNU Awk User’s Guide [EN]

• man 1 'awk' [EN]

Syntax

awk [PARAMETER ...] [FILE ...]

Parameters

-F SEPARATOR, --field-separator SEPARATOR

Use SEPARATOR for the input field separator (the value of the FS predefined variable).

Examples

Get the FQHN using nslookup

nslookup 'xeon' | awk --field-separator ':  *' '/Name/{print $2}'

Output:

xeon.raysoft.loc

Sort a comma separated string ignoring the first char

sed 's/\n//g; s/, */\n/g' <<<'.foo, #bar, -bla' \
| sort --key='1.2' \
| awk '{printf("%s%s", sep, $0); sep=", "} END {print ""}'

Output:

#bar, -bla, .foo