Mac OS X Tiger in a Nutshell

Name

let

Synopsis

                     
                        let
                      
                     expressions

Perform arithmetic as specified by one or more integer expressions. expressions consist of numbers, operators, and shell variables (which don’t need a preceding $), and must be quoted if they contain spaces or other special characters. For more information and examples, see the earlier section "Arithmetic Expressions,” and "expr" in Chapter 2.

Examples

Both of the following examples add 1 to variable i:

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