On Saturday 31 December 2005 20:38, Matthias Bethke wrote:
> Hi David,
>
> on Thursday, 2005-12-29 at 13:53:17, you wrote:
> > > $(ls *.jpg)
> >
> > ick!
> >
> > (incidentally, http://www.ruhr.de/home/smallo/award.html#ls)
>
> Well, it's bad in two ways, and even the example on the above webpage
> is wrong. For one thing, "ls" is useless here. For another, it will
> break
>
> on spaces in filenames, unlike shell globbing:
> | $ touch "foo bar.jpg"
> | $ for f in *.jpg; do echo $f; done
> | foo bar.jpg
> | $ for f in `ls *.jpg`; do echo $f; done
> | foo
> | bar.jpg
> | $ for f in `ls *.jpg`; do echo "$f"; done
> | foo
> | bar.jpg
>
> The bottommost try shows that the comment "newbies will often forget
> the quotes, too" is wrong -- it won't work either way. If you have to
> use
>
> a program that outputs a filename per line like ls, use a read loop:
> | $ ls *.jpg | while read f; do echo "$f"; done
> | foo bar.jpg
>
> The quotes are useless for "echo" here, but for other commands you'll
> usually need them to keep the command form taking filenames with
> sapaces as separate arguments.
>
> cheers!
> Matthias
It is the first part of the command, the one expanding ls output that
needs quotes...
$ for f in $"`ls *.jpg`"; do echo $f; done
foo bar.jpg
Ciao
Francesco
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