From 6a988e9325283efdbfc8d06e66901808750e2db8 Mon Sep 17 00:00:00 2001 From: Waldir Pimenta Date: Sat, 16 Jul 2016 13:30:28 +0100 Subject: [PATCH] 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. --- pages/common/awk.md | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/pages/common/awk.md b/pages/common/awk.md index 2bb17b8aa2..f4638e9bca 100644 --- a/pages/common/awk.md +++ b/pages/common/awk.md @@ -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}}`