Re: Bookworm: dash shell globs don't recognise [^...] to negate a character class
On 2023-04-16 11:04:09 +0700, Max Nikulin wrote:
> On 15/04/2023 19:37, Greg Wooledge wrote:
> > On Sat, Apr 15, 2023 at 11:02:12AM +0000, davidson wrote:
> > > On Sat, 15 Apr 2023 Max Nikulin wrote:
> > > > The problem is to prevent history expansion while keeping pattern
> > > > matching (glob) active.
> > > >
> > > > du -ks -- .[!.]* | sort -n | tail
> > >
> > > Are there versions of bash that exhibit history expansion in the
> > > example above?
> >
> > Not that I've found. I tried 3.2 and 2.05b and they're both fine.
>
> I am really sorry. I have checked the terminal app buffer where I was
> experimenting with history expansion and almost certainly I
> misinterpreted some result.
>
> I see that inside square brackets expansion of exclamation mark is
> suppressed when (and only when) it immediately follows the opening
> bracket.
> - [!c] is safe
> - [a-f!@1-2] and [0-9!] are affected by history expansion
> (and it is likely the source of my confusion)
Having such an exception is very ugly. Contrary to bash, ksh93 and zsh
do not have such an exception. But since this is for interactive use,
there is usually no need for portability, so that one can use ^
instead of ! in shells that have history expansion.
BTW, history expansion can be very useful, but IMHO, this should
have been interactive and triggered by control characters or
escape sequences, not by "normal" characters.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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