Linux shell variables get execution results

Linux shell variables get execution results

The method of assigning the result of a command to a variable is:

1, use the anti-quotation mark "(number key 1 left key, TAB key above, English way input)

such as: A= ' echo ' Hello World ';

Assigning the output of echo "Hello World" to the variable a

2. Can use $ (())

such as: a=$ (echo "Hello World")

Assigning the output of echo "Hello World" to the variable a

However, some UNIX systems do not support the $ () notation. But ' can be used under any UNIX or Linux system.

Linux shell variables get execution results