How many operation methods are there in shell

This article will explain in detail how many operation methods there are in shell. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Normal addition, multiplication and division operation of a.expr Note: expr can only operate on integers

Expr 2 + 2

Expr 2-2

Expr 2\ * 2

Expr 2 / 2

Note:

1. There is at least one space around the operator and the calculated number

two。 To use a multiplication sign, a backslash must be used to mask its specific meaning.

B.expr reference variable

Usage 1

# iTunes 1

# I = `expr $I + 1`

Usage 2

# axi2

# bread3

# expr $[aqb] or # expr $[$aquib]

Usage of c.$ (()) Note: the most efficient calculation method

# ((aq1 / 2 / 3 / 3))

# echo $a

The usage of d.let

# iTunes 1

# let i=i+100

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