From f8b83766ca261458bacf81d26a2a269f3ad08d82 Mon Sep 17 00:00:00 2001
From: onceupon <nim.1111.ou@gmail.com>
Date: Mon, 13 Feb 2017 16:15:38 +0800
Subject: [PATCH] add sed

insert character at specified position of file
---
 README.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 9aaab22..6e0e5e0 100644
--- a/README.md
+++ b/README.md
@@ -308,7 +308,10 @@ sed 's/A-.*-e//g' filename
 sed '$ s/.$//'
 ```
 
-
+#####insert character at specified position of file (e.g. AAAAAA --> AAA#AAA)
+```bash``
+sed -r -e 's/^.{3}/&#/' file
+```
 
 #Awk
 [[back to top](#handy-bash-oneliner-commands-for-tsv-file-editing)]