[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: best way to test for empty dir?
From: |
Greg Wooledge |
Subject: |
Re: best way to test for empty dir? |
Date: |
Thu, 10 Dec 2009 12:53:46 -0500 |
User-agent: |
Mutt/1.4.2.3i |
On Thu, Dec 10, 2009 at 05:31:20PM +0000, Marc Herbert wrote:
> Does anyone know a more elegant way to check for file existence?
> Something that does not fork a subshell. And is also more readable
> maybe. And is obviously not much longer.
shopt -s nullglob
files=(*)
if (( ${#files[*]} == 0 )); then ...
shopt -u nullglob
> Warning: I find neither "noglob" nor "ls" elegant, sorry!
Well, some people like doing it this way:
files=(*)
if [[ ! -e ${files[0]} ]]; then ...
But:
1) There's a race condition between the initial enumeration and the
check of the first element.
2) It fails to detect dotfiles (do you also consider "dotglob"
inelegant?).
3) I personally find it even more of a hack than enabling nullglob.
- best way to test for empty dir?, Marc Herbert, 2009/12/10
- Re: best way to test for empty dir?,
Greg Wooledge <=
- Re: best way to test for empty dir?, Matias A. Fonzo, 2009/12/10
- Re: best way to test for empty dir?, Chris F.A. Johnson, 2009/12/10
- Message not available
- Re: best way to test for empty dir?, pk, 2009/12/10
- Re: best way to test for empty dir?, pk, 2009/12/10
- Re: best way to test for empty dir?, Marc Herbert, 2009/12/11
- Message not available
- Re: best way to test for empty dir?, pk, 2009/12/11
- Re: best way to test for empty dir?, Sven Mascheck, 2009/12/11
- Re: best way to test for empty dir?, Chris F.A. Johnson, 2009/12/11