How to use the common command let in Linux

This article mainly shows you "Linux common command let how to use", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "Linux common command let how to use" this article.

Linux common command let command is a tool used for evaluation in BASH, which is used to execute one or more expressions, and there is no need to add $to the evaluation of variables. If the expression contains spaces or other special characters, it must be quoted.

Syntax format let arg [arg...] Parameter description: arg: the expression to be executed

Example: self-adding operation: let no++

Self-subtractive operation: let no-

The abbreviated form let no+=10,let no-=20 is equivalent to let no=no+10,let no=no-20 respectively.

The following example evaluates the expressions an and b and outputs the results:

#! / the execution result of an instance above #! / bin/bash let axi4let bail9-3 echo $a $b is as follows:

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