set -I is not required by standard, and does not match bash

set -I is not required by standard, and does not match bash

[Denys Vlasenko]

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).

Standards do not mention any -I option.

I propose, in the interests of keeping things less disparate,
to remove set -I support from dash: make "ignoreeof" to be
only an -o long option.

Re: set -I is not required by standard, and does not match bash

[Herbert Xu]

On Mon, Jan 04, 2021 at 01:22:30PM +0100, 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).
> 
> Standards do not mention any -I option.
> 
> I propose, in the interests of keeping things less disparate,
> to remove set -I support from dash: make "ignoreeof" to be
> only an -o long option.

This option goes all the way back to BSD.  Unless they have all
removed this option I'm not going to change it.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Re: set -I is not required by standard, and does not match bash

[Harald van Dijk]

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