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awk: introduce $NF (#956)

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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.
This commit is contained in:
Waldir Pimenta 2016-07-16 13:30:28 +01:00 • committed by Leandro Ostera
parent 007ae49340
commit 6a988e9325
1 changed files with 5 additions and 5 deletions
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10
pages/common/awk.md
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@ -2,19 +2,19 @@
> A versatile programming language for working on files.
- Print the fifth column in a space separated file:
- 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:
- Print the second column of the lines containing "something" in a space-separated file:
`awk '/{{something}}/ {print $2}' {{filename}}`
- Print the third column in a comma separated file:
- Print the last column of each line in a file, using a comma (instead of space) as a field separator:
`awk -F ',' '{print $3}' {{filename}}`
`awk -F ',' '{print $NF}' {{filename}}`
- Sum the values in the first column and print the total:
- Sum the values in the first column of a file and print the total:
`awk '{s+=$1} END {print s}' {{filename}}`