Linux in a Nutshell, Third Edition

Name

let

Synopsis

let expressions

Description

Perform arithmetic as specified by one or more integer expressions. expressions consist of numbers, operators, and shell variables (which don’t need a preceding $). Expressions must be quoted if they contain spaces or other special characters. For more information and examples, see Section 7.5 earlier in this chapter. See also expr in Chapter 3.

Examples

Both of the following examples add 1 to variable i:

let i=i+1
let "i = i + 1"