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Re: negative offset parameter expansion
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From: |
Stephane Chazelas |
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Subject: |
Re: negative offset parameter expansion |
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Date: |
Tue, 12 Oct 2004 10:08:51 +0100 |
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User-agent: |
Mutt/1.5.6i |
On Tue, Oct 12, 2004 at 10:42:24AM +0200, jochen@puchalla-online.de wrote:
[...]
> export bla=bla.WaV
> echo ${bla:-3}
>
> This should deliver "WaV", following the manpage, but I get "bla.WaV"
[...]
Yes, that's a design bug borrowed from ksh. The behavior you are
observing is the Bourne one described at:
info -f bash -n 'Shell Parameter Expansion'
`${PARAMETER:-WORD}'
If PARAMETER is unset or null, the expansion of WORD is
substituted. Otherwise, the value of PARAMETER is substituted.
What you want is ${bla: -3} or ${bla:0-3}
Or the POSIX: ${bla#"${bla%???}"}
--
Stephane
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