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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/

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
if (( ${#files[*]} == 0 )); then ...
shopt -u nullglob

> Warning: I find neither "noglob" nor "ls" elegant, sorry!

Well, some people like doing it this way:

if [[ ! -e ${files[0]} ]]; then ...

  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"
  3) I personally find it even more of a hack than enabling nullglob.

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