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Re: ${param+x} ?
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From: |
Davide Brini |
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Subject: |
Re: ${param+x} ? |
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Date: |
Tue, 19 Dec 2023 12:03:06 +0100 |
On Tue, 19 Dec 2023 11:38:50 +0100, lacsaP Patatetom <patatetom@gmail.com>
wrote:
> this form `${param+x}` is not documented (man) but is accepted by bash and
> differs from `${param:+x}` :
It IS documented:
When not performing substring expansion, using the forms documented
below (e.g., :-), bash tests for a parameter that is unset or null.
Omitting the colon results in a test only for a parameter that is unset.
--
D.