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Re: what is wrong here?

From: Greg Wooledge
Subject: Re: what is wrong here?
Date: Wed, 28 Mar 2012 14:42:11 -0400
User-agent: Mutt/

On Mon, Aug 08, 2011 at 03:41:52PM +0200, mhenn wrote:
> Am 08.08.2011 15:22, schrieb Francky Leyn:
> > On 8/8/2011 2:17 PM, mhenn wrote:
> >> Am 08.08.2011 11:33, schrieb Francky Leyn:
> >>> consider the following code:
> >>>
> >>> EXTENSION=jpg
> >>
> >> echo "$INPUT_FILES" #obviously wrong
> >> #instead maybe

They are both incorrect.  If you want a list of all the files that match
a glob, use an array to hold them:


Parameter expansion ($extension) happens before globbing (*.jpg), and
the results will be placed into an array.  Filenames with whitespace
will be handled correctly.

> > This worked when there were files.
> > But when there were no matching files, it didn't.

If you want the array to be empty when there are no matching files, then
you must enable bash's nullglob option:

shopt -s nullglob

See also http://mywiki.wooledge.org/BashFAQ/004 (checking/counting files)
     and http://mywiki.wooledge.org/BashFAQ/005 (arrays)
     and http://mywiki.wooledge.org/glob        (globs)

Using ls in a script is almost always wrong, unless you're simply dumping
its output to a terminal for a human to read.  Use globs instead.

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