Linux shell script written in

1. Create a new text editor
vim test.sh

1. Press the "i" type insert mode
   input

   Explain comments represent content

   Note that different types of content or code in two rows separated by spaces, to facilitate comprehension
   3. Press the "Esc" to exit the insert mode. Enter ": wq" to save and exit
   4. Run the command: SH test.sh
   5. It also can execute this
   
   gives execute permissions, you can directly ./test.sh