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Re: Substring Expansion does not work as intended


From: Chris F.A. Johnson
Subject: Re: Substring Expansion does not work as intended
Date: Wed, 20 Aug 2014 15:52:05 -0400 (EDT)
User-agent: Alpine 2.10 (DEB 1266 2009-07-14)

On Wed, 20 Aug 2014, Eric Blake wrote:

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 use a variable:

o=-2
echo "${x:$o}"

--
Chris F.A. Johnson, <http://cfajohnson.com>



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