Regular updates

[twpd/master.git] / sed.md

diff --git a/sed.md b/sed.md
index ca1439e..509e4d0 100644 (file)
--- a/sed.md
+++ b/sed.md
@@ -3,39 +3,54 @@ title: sed
 category: CLI
 layout: 2017/sheet
 intro: |
-  Here's home hints on using sed.
+  Here's some hints on using sed.
 ---
 
-### In place replacements
+## In place replacements
 
-#### In GNU sed: use `-i` without arg.
+### In-place replacement (GNU)
 
 ```bash
 sed -i -e 's/foo/bar/' example.md
 ```
 
-#### In OSX, `-i ''` is required.
+In GNU sed: use `-i` without arg.
+
+#### In-place replacement (BSD)
 
 ```bash
 sed -i '' -e 's/foo/bar/' example.md
 ```
 
-### File regions
+ In OSX, `-i ''` is required.
+
+## File regions
+{:.-three-column}
 
-#### Print until a certain line is met
+### Print until a certain line is met
 
 ```bash
 sed '/begin api/q'
 ```
 
-#### Print until a certain line is met, but not that line
+### Print until a certain line is met, but not that line
 
 ```bash
 sed '/^# begin/,$d'
 ```
 
-#### Print everything after a given line
+### Print everything after a given line
 
 ```bash
 sed -n '/end api/,$p'
 ```
+
+Print after a given line is found.
+
+### Print everything except matching
+
+```bash
+sed -n '/regex/!p'
+```
+
+Print everything except lines matching regex. Useful for printing files with comments.