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tldr/pages/common/awk.md
Waldir Pimenta 6a988e9325 awk: introduce $NF (#956) 
Numbered field references have been used in the first two examples,
so it's quite reasonable to take the opportunity to introduce a new (and quite useful!) concept.

In addition, this commit makes a few tweaks to the example descriptions, to make them clearer.
2016-07-16 14:30:28 +02:00

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awk

A versatile programming language for working on files.

  • Print the fifth column (a.k.a. field) in a space-separated file:

awk '{print $5}' {{filename}}

  • Print the second column of the lines containing "something" in a space-separated file:

awk '/{{something}}/ {print $2}' {{filename}}

  • Print the last column of each line in a file, using a comma (instead of space) as a field separator:

awk -F ',' '{print $NF}' {{filename}}

  • Sum the values in the first column of a file and print the total:

awk '{s+=$1} END {print s}' {{filename}}

  • Sum the values in the first column and pretty-print the values and then the total:

awk '{s+=$1; print $1} END {print "--------"; print s}' {{filename}}