tldr/pages/common/awk.md

# 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}}`

- Print every third line starting from the first line:

`awk 'NR%3==1' {{filename}}`
Adding a file for awk. 2014-03-08 17:03:01 +00:00			`# awk`

Formatted all pages according to guidelines. 2016-01-07 17:31:27 +00:00			`> A versatile programming language for working on files.`
Adding a file for awk. 2014-03-08 17:03:01 +00:00
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 13:30:28 +01:00			`- Print the fifth column (a.k.a. field) in a space-separated file:`
Adding a file for awk. 2014-03-08 17:03:01 +00:00
			`awk '{print $5}' {{filename}}`

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 13:30:28 +01:00			`- Print the second column of the lines containing "something" in a space-separated file:`
awk: add /search/ example 2016-02-04 18:30:40 +00:00
			`awk '/{{something}}/ {print $2}' {{filename}}`

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 13:30:28 +01:00			`- Print the last column of each line in a file, using a comma (instead of space) as a field separator:`
Adding a file for awk. 2014-03-08 17:03:01 +00:00
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 13:30:28 +01:00			`awk -F ',' '{print $NF}' {{filename}}`
Adding a file for awk. 2014-03-08 17:03:01 +00:00
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 13:30:28 +01:00			`- Sum the values in the first column of a file and print the total:`
Adding a file for awk. 2014-03-08 17:03:01 +00:00
			`awk '{s+=$1} END {print s}' {{filename}}`

Formatted all pages according to guidelines. 2016-01-07 17:31:27 +00:00			`- Sum the values in the first column and pretty-print the values and then the total:`
Adding a file for awk. 2014-03-08 17:03:01 +00:00
			`awk '{s+=$1; print $1} END {print "--------"; print s}' {{filename}}`
awk: add print every nth line example (#2008) 2018-02-23 06:05:11 +00:00
			`- Print every third line starting from the first line:`

			`awk 'NR%3==1' {{filename}}`