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Re: Substring Expansion does not work as intended


From: Eckard Brauer
Subject: Re: Substring Expansion does not work as intended
Date: Wed, 20 Aug 2014 16:16:44 +0200

Hello,

I see.

My fault - thanks for the lesson... thought I had already used that at
a time, but can't remember for sure.

@Greg: The explanation does illustrate it very nice, as I regularly use
the ":-" - should have noticed that.

Thanks again, and kind regards
Eckard

Am Wed, 20 Aug 2014 07:50:09 -0600
schrieb Eric Blake <address@hidden>:

> On 08/20/2014 07:05 AM, address@hidden wrote:
> 
> Not a bug.
> 
> > 
> > Description:
> >     Substring Expansion actually works different than manpage
> > states, namely:
> > 
> >     "If offset evaluates to a number less than zero, the value
> > is used as an offset from the end of the value of parameter."
> 
> Read further.
> 
> "Note that a negative offset must be separated from the colon by at
> least one space to avoid being confused with the :- expansion."
> 
> > 
> > Repeat-By:
> >     x="abcdef"; echo "${x:-2}"
> >     Expected: ef
> >     Got:      abcdef
> 
> echo "${x: -2}"
> 
> > 
> >     or:
> >     x="abcdef"; echo "${x:-2:1}"
> >     Expected: e
> >     Got:      abcdef
> 
> echo "${x: -2:1}"
> 



-- 
:)

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