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Re: Negative offset with variable expansion doesn't work


From: Paul Jarc
Subject: Re: Negative offset with variable expansion doesn't work
Date: Tue, 21 May 2002 11:31:11 -0400
User-agent: Gnus/5.090007 (Oort Gnus v0.07) Emacs/21.2 (i686-pc-linux-gnu)

Chet Ramey <chet@nike.ins.cwru.edu> wrote:
>> echo ${var:-2:2}
>
> Of course.  The `:-' doesn't specify a negative offset.

But this is an easy mistake to make, given the text of the man page.
It would be helpful to mention that a negative value should be
parenthesized, or preceded by a space, or otherwise distinguished from
the :- case.


paul



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