Re: bash scripting: mplayer command line playlist

I opened two konsoles.
In the first one I typed find /mnt/mp3 -name *.mp3 | more
so I could get a list of what mplayer would see...

Second console;
find /mnt/mp3 -name *.mp3 -exec mplayer -shuffle {} \;

Guess what!
It played the files in alphabetical order...
No shuffle.

nathan



On Saturday 19 February 2005 10:47, June Tate wrote:
> On Feb 19, 2005, at 9:12 AM, Eric "Shubes" wrote:
> > Nathan England wrote:
> >> On Friday 18 February 2005 10:25, Eric "Shubes" wrote:
> >>> Mike Hoy wrote:
> >>>
> >>> find music/ -name '*.mp3' -exec mplayer -shuffle {} \;
> >>>
> >>> Note, you probably want to add the full path to your music/
> >>> directory.
> >>
> >> This would tell mplayer to shuffle the 1 song it sent, right?
> >
> > Bsst. Wrong.
>
> You sure about that? Because according to the man page for find, "If
> the string ``{}'' appears anywhere in the utility name or the arguments
> it is replaced by the pathname _of the current file_" (emphasis added,
> gleaned from the MacOS X Panther "man find", but also found in Debian's
> man page around line 262).
>
> So according to this, what find will do is essentially the same thing
> that a "for i in $LIST; do $COMMAND; done" would do, and that is call
> "mplayer -shuffle $i" for every file that is found, with one on each
> command. Essentially it would be equivalent to doing this:
>

>      foo@bar:~$ mplayer -shuffle $file1
>      foo@bar:~$ mplayer -shuffle $file2
>      foo@bar:~$ mplayer -shuffle $file3
>      (...ad infinitum...)

>
> To pass the _entire_ list to mplayer as a -shuffle argument list
> instead, do it like this:
>

>      foo@bar:~$ mplayer -shuffle $(find music/ -name '*.mp3')

>
> A good way to illustrate this is to instead pass the arguments to the
> printf command. If we call printf like this:
>

>      foo@bar:~$ printf "%s\n" $(find music/ -name '*.mp3')

>
> You'll notice that all of the filenames that find finds are printed
> right next to each other, separated by a space. If we do it like this,
> however:
>

>      foo@bar:~$ find music/ -name '*.mp3' -exec printf "%s" '{}' ';'

>
> Each filename is printed on a separate line, because of the same effect
> mentioned above. What we want is to pass the entire results of the
> search to mplayer, so we should use the $(find ...) form instead of the
> find -exec form.
>
> HTH =o)
>
> --
> June Tate * http://www.theonelab.com * june@theonelab.com
>
>
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