Create Shell Programming.md

Author: xuchaoyong

Shell Programming.md

@@ -0,0 +1,13 @@
+##1. replace the specific line
+```
+sed '4 s/hello/good/g' file
+sed '4a drink tea' file
+sed '4d'
+sed -n '5,7p'
+
+```
+
+##2. print the specific colume
+```
+sed -n '5p' hello | awk 'BEGIN {FS=","} {print $4}'
+```