z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

ld
Localization
Exit values
Related information
c89
ld uses the following localization environment variables:
v LANG
v LC_ALL
v LC_CTYPE
v LC_MESSAGES
0 Successful completion.
>0 An error occurred during processing.
let — Evaluate an arithmetic expression
Format
Description
Examples
let expression ...
((expression))
let evaluates each arithmetic expression from left to right, with normal algebraic
precedence (multiplication before addition, for example). let uses long integer
arithmetic with no checks for overflow. No output is generated; the exit status is 0 if
the last expression argument has a nonzero value, and 1 otherwise.
The following two lines are equivalent: the second form avoids quoting and
enhances readability. These two forms are extensions to the POSIX standard.
let "expression"
((expression))
The POSIX version of this command is as follows:
$((expression))
Expressions consist of named variables, numeric constants, and operators.
Characters in the names of named variables must come from the POSIX portable
character set.
See “Arithmetic Substitution” on page 562
Examples of the three forms of the let command are as follows:
1. The example
let a=7
echo $a
produces:
7
2. The example
echo $((a=7*9))
342 z/OS V1R9.0 UNIX System Services Command Reference