Ali cloud university teaching https://edu.aliyun.com/course/155/
Run chmod + x xx.sh
./xx.sh
The basic syntax: echo $ output assignment
Special variables:
$*
Use variables
read command to read keyboard input
expr operation include a space expr 3 + 5
Backslash cancel special symbols meaning
Backticks usage:
test: Test of Variables
Whether -n is empty
>= -ge
> -gt
<= -The
May not equal -ne square brackets [] xx -lt xx