Daniel B. Thurman wrote:
> It has been awhile since I have been programming in
> bash or using the 'find' command and what I am trying
> to do is to figure out how to run a command to decode
> all my .mpc files into wav as follows:
>
> 1. Find all MPC files
> 2. Run each file through mppdec
>
> I tried to do this using the 'find' command or even with a
> bash script.
>
> Using find:
> ========
> find *.mpc -type f -exec mppdec '{}' `echo {} | sed s/.mpc/.wav` \;
> ** fails because you cannot use {} more than once and also exec is
> mangled.
>
> I recalled using xargs from my past, but cannot remember how to do
> it.
>
> find *.mpc -type f -print0 | xargs ?????
>
> Since I had used find/xargs in the past, I have not encountered
> cases where filenames can have spaces or other characters embedded,
> so this is new for me. I was not able to get around this issue with
> find nor with bash scripts.
Something like this perhaps:
find -name '*.mpc' | while read mpc; do
wav="${mpc/.mpc/.wav}"
mppdec "$mpc" "$wav"
done
That would find all the .mpc files and loop through them line by line,
reading the filename into the mp3 variable. Then a little bash
substitution replace .mpc with .wav and creates a wav var. Finally,
mppdec is called to decode them.
I think something similar with xargs would work too:
find -name '*.mpc' -print0 | \
xargs -0 -i mppdec "{}" "`echo {} | sed s/.mpc/.wav`"
Neither of these are tested, so if it breaks, the pieces are yours to
cherish.
--
Todd OpenPGP -> KeyID: 0xBEAF0CE3 | URL: www.pobox.com/~tmz/pgp
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