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+##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 in three methods
+```
+sed -n '5p' hello | awk 'BEGIN {FS=","} {print $4}'
+head -n 4 hello | tail -n 1 | cut -d " " -f 3
+sed -n 4p hello | cut -d " " -f 3
+#There are two way to get the specific column with cut or awk. Also, head and tail to get the certain line.
+```