man/man1/let.1

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 LET 1 "Nov 2, 2007"
 NAME
let - shell built-in function to evaluate one or more arithmetic expressions
 SYNOPSIS
 "ksh"

let arg...


 "ksh93"

let [expr...]


 DESCRIPTION
 "ksh"

Each arg is a separate arithmetic expression to be evaluated.
 "ksh93"

let evaluates each expr in the current shell environment as an
arithmetic expression using ANSI C syntax. Variables names are shell variables
and they are recursively evaluated as arithmetic expressions to get numerical
values. let has been made obsolete by the ((...)) syntax of
ksh93(1) which does not require quoting of the operators to pass them as
command arguments.
 EXIT STATUS
 "ksh"

ksh returns the following exit values:
0

The value of the last expression is non-zero.


1

The value of the last expression is zero.


 "ksh93"

ksh93 returns the following exit values:
0

The last expr evaluates to a non-zero value.


>0

The last expr evaluates to 0 or an error occurred.


 SEE ALSO

ksh(1), ksh93(1), set(1), typeset(1),
attributes(5)