Scripting standard formatting and execution scripts

Scripting Standard Format:

First line: #!/bin/bash means that the script is defined as a shell script (fixed format)

The second line: # Here is the note, there is no meaning, the shell will not parse it.

Line three: #说明一下该脚本的作用

Line four: #写一下脚本的author (author) writing time

Line five: Write the contents of the script

234 line is optional, suggest to develop good habits.

To execute a script (for example: first_shell.sh):

(1) Plus execute permission: chmod o+x first_shell.sh

Run the script:./first_shell.sh

(2) Run the script without executing permissions:

/bin/bash first_shell.sh

Scripting standard formatting and execution scripts