Jamie Lokier <ja...@shareable.org> writes:

> Pádraig Brady wrote:
>> > The $(( ... )) construct is standard POSIX shell syntax, see
>> > http://www.opengroup.org/onlinepubs/000095399/utilities/xcu_chap02.html#tag_02_06_04
>> > 
>> > Bash supports $[ ... ] as an alternate syntax for the same thing.
>> > Perhaps you were thinking of that.
>> 
>> I think the misconception that $(( ... )) is a bashism is caused by
>> the wrong highlighting defaults chosen by vim.
>
> I think the misconception is because traditional unix bourne shells
> don't implement that construct.  I just tried it on a few machines,
> and it failed on 4 of them.  Admittedly, the only up to date one is
> running Solaris 10; the others are older unixes that you're unlikely
> to build Linux on.

On Solaris, /usr/xpg4/bin/sh is usually a POSIX-compliant shell.  I
don't know how long it has been there.

-- 
Måns Rullgård
m...@mansr.com
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