How to write and execute shell script?

1.  open teminal
2. create file
• e.g.  touch test.sh
3. use any editor to write shell script
• e.g.  By using vim editor
• vim test.sh
• i < - used to insert or write in file
• Write your code ( example )
• To save and exit
• press ESC button and write :wq! and press enter
4. To run shell script
• ./test.sh