standards/52972: /bin/sh arithmetic not POSIX compliant

Wartan Hachaturow wart at
Sun Jun 22 14:50:18 PDT 2003

The following reply was made to PR standards/52972; it has been noted by GNATS.

From: Wartan Hachaturow <wart at>
To: Jens Schweikhardt <schweikh at>
Cc: GNATS Bug Followup <bug-followup at>
Subject: Re: standards/52972: /bin/sh arithmetic not POSIX compliant
Date: Mon, 23 Jun 2003 01:41:42 +0400

 On Sun, Jun 22, 2003 at 10:43:27PM +0200, Jens Schweikhardt wrote:
 > [please always cc to <bug-followup at> with the subject left as
 > is (like in this mail), so GNATS can add your comments to the audit
 > trail. Thanks!]
 Sure, I just thought my initial letter wasn't valuable enough to
 be included in the trail :)
 > The recursive processing requires that $(($a+1)) needs to undergo
 > parameter expansion within $(()).
 Right, but this construction works in /bin/sh:
 wart at mojo:~$ /bin/sh
 $ a=1
 $ echo $(($a+1))
 You've said the problem was with the variable without leading $, like
 $ a=1
 $ echo $((a+1)) 
 arith: syntax error: "a+1"
 And, as far as my English allows me to judge, the quoted part of SUS
 says that "a" in this construct should be left in output as is (since it
 doesn't have leading $, ${, $(, etc.), shouldn't it?
 Regards, Wartan.
 "Computers are not intelligent. They only think they are."

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