* Glob Qualifier Yn enables short-circuit mode behaves oddly
@ 2022-03-11 13:09 zzapper
2022-03-11 13:50 ` Mikael Magnusson
0 siblings, 1 reply; 4+ messages in thread
From: zzapper @ 2022-03-11 13:09 UTC (permalink / raw)
To: Zsh-Users List
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Hi
> print *(.omY3)
notebash.txt note132.txt note020.txt
I don't know why it's selected those 3 files but it always does
Yn
enables short-circuit mode: the pattern will expand to at most n
filenames. If more than n matches exist, only the first n matches in
directory traversal order will be considered.
Implies oN when no oc qualifier is used.
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Glob Qualifier Yn enables short-circuit mode behaves oddly
2022-03-11 13:09 Glob Qualifier Yn enables short-circuit mode behaves oddly zzapper
@ 2022-03-11 13:50 ` Mikael Magnusson
2022-03-11 14:12 ` zzapper
0 siblings, 1 reply; 4+ messages in thread
From: Mikael Magnusson @ 2022-03-11 13:50 UTC (permalink / raw)
To: zzapper; +Cc: Zsh-Users List
On 3/11/22, zzapper <zsh@rayninfo.co.uk> wrote:
> Hi
>
> > print *(.omY3)
>
> notebash.txt note132.txt note020.txt
>
> I don't know why it's selected those 3 files but it always does
>
>
> Yn
>
> enables short-circuit mode: the pattern will expand to at most n
> filenames. If more than n matches exist, only the first n matches in
> directory traversal order will be considered.
>
> Implies oN when no oc qualifier is used.
You've included the answer in your mail, Y3 will stop looking at files
after finding 3 in directory traversal order, those 3 files are then
sorted according to their modification timestamp. If you want to
consider all files in the directory, use [3] instead of Y3.
--
Mikael Magnusson
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Glob Qualifier Yn enables short-circuit mode behaves oddly
2022-03-11 13:50 ` Mikael Magnusson
@ 2022-03-11 14:12 ` zzapper
2022-03-11 14:34 ` Peter Stephenson
0 siblings, 1 reply; 4+ messages in thread
From: zzapper @ 2022-03-11 14:12 UTC (permalink / raw)
To: Mikael Magnusson, Zsh-Users List
On 11/03/2022 13:50, Mikael Magnusson wrote:
> On 3/11/22, zzapper <zsh@rayninfo.co.uk> wrote:
>> Hi
>>
>> > print *(.omY3)
>>
>> notebash.txt note132.txt note020.txt
>>
>> I don't know why it's selected those 3 files but it always does
>>
>>
>> Yn
>>
>> enables short-circuit mode: the pattern will expand to at most n
>> filenames. If more than n matches exist, only the first n matches in
>> directory traversal order will be considered.
>>
>> Implies oN when no oc qualifier is used.
> You've included the answer in your mail, Y3 will stop looking at files
> after finding 3 in directory traversal order, those 3 files are then
> sorted according to their modification timestamp. If you want to
> consider all files in the directory, use [3] instead of Y3.
>
MM,
So what then is traversal order?
zzapper
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Glob Qualifier Yn enables short-circuit mode behaves oddly
2022-03-11 14:12 ` zzapper
@ 2022-03-11 14:34 ` Peter Stephenson
0 siblings, 0 replies; 4+ messages in thread
From: Peter Stephenson @ 2022-03-11 14:34 UTC (permalink / raw)
To: zzapper, Mikael Magnusson, Zsh-Users List
> On 11 March 2022 at 14:12 zzapper <zsh@rayninfo.co.uk> wrote:
> On 11/03/2022 13:50, Mikael Magnusson wrote:
> > On 3/11/22, zzapper <zsh@rayninfo.co.uk> wrote:
> >> Hi
> >>
> >> > print *(.omY3)
> >>
> >> notebash.txt note132.txt note020.txt
> >>
> >> I don't know why it's selected those 3 files but it always does
> >>
> >>
> >> Yn
> >>
> >> enables short-circuit mode: the pattern will expand to at most n
> >> filenames. If more than n matches exist, only the first n matches in
> >> directory traversal order will be considered.
> >>
> >> Implies oN when no oc qualifier is used.
> > You've included the answer in your mail, Y3 will stop looking at files
> > after finding 3 in directory traversal order, those 3 files are then
> > sorted according to their modification timestamp. If you want to
> > consider all files in the directory, use [3] instead of Y3.
>
> So what then is traversal order?
It's totally arbitrary -- whatever the OS throws up. That's the point
of this optimisation --- you've told the shell you don't care what's
there, you're just interested in there being something. I think the
technical answer is likely to be "inode order".
Typical usage of this feature is with a 1 to grab one file that might
be the only one (but if it isn't you don't care).
pws
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-03-11 14:34 UTC | newest]
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2022-03-11 13:09 Glob Qualifier Yn enables short-circuit mode behaves oddly zzapper
2022-03-11 13:50 ` Mikael Magnusson
2022-03-11 14:12 ` zzapper
2022-03-11 14:34 ` Peter Stephenson
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