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* quick and dirty test for empty directory
@ 2022-11-16 16:17 Ray Andrews
  2022-11-16 16:23 ` Roman Perepelitsa
  0 siblings, 1 reply; 3+ messages in thread
From: Ray Andrews @ 2022-11-16 16:17 UTC (permalink / raw)
  To: Zsh Users

Best advice googling for such a test is this:

                 [ -d "$dir" ] && [ -n "$(ls -A  $dir)" ]   # If true, 
dir isn't empty.

... but experimenting:

2 /media/sdb 0 $ [ /media/sdb/3/* ] && echo file found

2 /media/sdb 0 $ [ /media/sdb/2/* ] && echo file found
file found

... correct result. I does have a certain logic to it.  If there's no 
expansion then the test fails.  Dare I use it or is this bound to crash 
and burn somehow or other?  Anyway I can't believe a call to 'ls' is 
really needed.




^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: quick and dirty test for empty directory
  2022-11-16 16:17 quick and dirty test for empty directory Ray Andrews
@ 2022-11-16 16:23 ` Roman Perepelitsa
  2022-11-16 18:00   ` Ray Andrews
  0 siblings, 1 reply; 3+ messages in thread
From: Roman Perepelitsa @ 2022-11-16 16:23 UTC (permalink / raw)
  To: Ray Andrews; +Cc: Zsh Users

On Wed, Nov 16, 2022 at 5:18 PM Ray Andrews <rayandrews@eastlink.ca> wrote:
>
> Best advice googling for such a test is this:
>
>                  [ -d "$dir" ] && [ -n "$(ls -A  $dir)" ]   # If true,
> dir isn't empty.

Try this:

  [[ -n $dir(#qNF) ]] && print -r -- "$dir is a non-empty directory"

This requires extended_glob.

Roman.


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: quick and dirty test for empty directory
  2022-11-16 16:23 ` Roman Perepelitsa
@ 2022-11-16 18:00   ` Ray Andrews
  0 siblings, 0 replies; 3+ messages in thread
From: Ray Andrews @ 2022-11-16 18:00 UTC (permalink / raw)
  To: zsh-users


On 2022-11-16 08:23, Roman Perepelitsa wrote:
> [[ -n $dir(#qNF) ]] && print -r -- "$dir is a non-empty directory"

Looks good.  And seems to obviate the '-d' test as well.




^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2022-11-16 18:00 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-11-16 16:17 quick and dirty test for empty directory Ray Andrews
2022-11-16 16:23 ` Roman Perepelitsa
2022-11-16 18:00   ` Ray Andrews

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