From 42c4782598dae5728539b24f83ebafc3e33b7448 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Tue, 23 Jan 2024 00:42:12 +0100
Subject: sed: delete matching lines

---
 src/tools/sed.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/tools/sed.md b/src/tools/sed.md
index 1746c24..1bd8185 100644
--- a/src/tools/sed.md
+++ b/src/tools/sed.md
@@ -30,6 +30,16 @@ echo -e 'aa\nbb\ncc\ndd' | sed '$d'
 # Delete range of lines.
 echo -e 'aa\nbb\ncc\ndd' | sed '1,3d'
 # dd
+
+# Delete lines matching pattern.
+echo -e 'aa\nbb\ncc\ndd' | sed '/bb/d'
+# aa
+# cc
+# dd
+
+# Delete lines NOT matching pattern.
+echo -e 'aa\nbb\ncc\ndd' | sed '/bb/!d'
+# bb
 ```
 
 ### Insert lines
-- 
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