Linux let Command

Linux Command Manual

Command: let

The let command is a tool used in BASH for calculation, which is used to execute one or more expressions. Variables do not need to be prefixed with $ to indicate them in variable calculation. If the expression contains spaces or other special characters, they must be quoted.

Syntax Format

let arg [arg ...]

Parameter Description:

arg: The expression to be executed

Example:

Increment Operation:,let no++

Decrement Operation:,let no--

Abbreviated Form ,let no+=10,let no-=20,which is equivalent to ,let no=no+10,let no=no-20.

The following example calculates the results of two expressions a and b and outputs them:

#!/bin/bash
let a=5+4
let b=9-3 
echo $a $b

The execution results of the above examples are:

9 6

Linux Command Manual