From 44e8fe89023e512afdc48b02c54860d8de3cc23d Mon Sep 17 00:00:00 2001
From: johannst <johannes.stoelp@gmail.com>
Date: Fri, 18 Dec 2020 17:19:04 +0100
Subject: awk: example how to access last fields in a record

---
 src/tools/awk.md | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/tools')

diff --git a/src/tools/awk.md b/src/tools/awk.md
index 38b0cb1..f8aa0a8 100644
--- a/src/tools/awk.md
+++ b/src/tools/awk.md
@@ -59,6 +59,7 @@ multiple times. Actions with those patterns are **executed exactly once**.
 - `FS` _field separator_: regex to split records into fields, by default
   <space>
 - `NR` _number record_: number of current record
+- `NF` _number fields_: number of fields in the current record
 
 ### Special statements & functions
 
@@ -96,6 +97,12 @@ awk 'NR%2 == 0 { print $0 }' <file>
 The pattern `NR%2 == 0` matches every second record and the action `{ print $0 }`
 prints the whole record.
 
+### Access last fields in records
+```bash
+echo 'a b c d e f' | awk '{ print $NF $(NF-1) }'
+```
+Access last fields with arithmetic on the `NR` number of fields variable.
+
 ### Capture in variables
 ```bash
 # /proc/<pid>/status
-- 
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