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From:   Harald van Dijk <harald@gigawatt.nl>
Subject: Re: set -I is not required by standard, and does not match bash
To:     Denys Vlasenko <vda.linux@googlemail.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        DASH shell mailing list <dash@vger.kernel.org>
References: <CAK1hOcPjYpXa8GQsD5dmYnkUHqc_KC2BXj0NC6d49qi10Qt4kA@mail.gmail.com>
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Date:   Mon, 4 Jan 2021 21:19:38 +0000
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On 04/01/2021 12:22, Denys Vlasenko wrote:
> Hello,
> 
> In dash, set -I is a short-option alias to set -o ignoreeof.
> 
> However, bash does not have such alias, it has an undocumented
> set -I which switches off "invisible variables"
> (I don't know what that is).

bash does not have any set -I. bash *had* a set -I, but dropped it in 
version 5.1, so there is no longer a compatibility issue to worry about.

Cheers,
Harald van Dijk