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Re: [PATCH] printf: add %#s alias to %b

From: Chet Ramey
Subject: Re: [PATCH] printf: add %#s alias to %b
Date: Tue, 5 Sep 2023 16:44:52 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.14.0

On 9/5/23 4:32 PM, Dragan Simic wrote:
On 2023-09-05 22:25, Chet Ramey wrote:
On 9/5/23 3:58 PM, enh wrote:
On Fri, Sep 1, 2023 at 6:59 AM Chet Ramey <> wrote:

I think you'll find that, regardless of its origins, there are more scripts
using the %b specifier than you think.

i'd personally never heard of printf(1) %b before this thread, but
debian code search agrees with you:

It's a POSIX invention dating from at least 1991 (P1003.2-D11).

The POSIX guidance to use it as a portable way to replace SysV echo has
dated from the same time. It's a pretty big lift to suddenly invalidate
all that prior art. ("POSIX giveth, and POSIX taketh away.").

Are there any official explanations why is the invalidation actually happening now?

C23 is going to use %b to print binary literals.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU

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