Linux inverted quotes, single quotes, double quotes

1. Inverted quotation marks indicate command

echo now is ' date ' or Echo now is $ (date)

2. Single quotation mark

Name=andy no problem,

If you want to Name=andy Niu, error: Bash:niu:command not found, the program considers the first space after the command. How to solve this problem?

Use single quotes name= ' Andy Niu '

3. Double quotation marks

Desc= ' I am $name '

Echo $desc

I am $name ', I want to show is I am Andy Niu. What to do?

Use double quotation marks, double quotation marks for the $, \ (backslash), and (inverted quotation marks) in the special treatment.

Linux inverted quotes, single quotes, double quotes