so in this case we have files named like this: 

track01.cdda.wav.mp3  track06.cdda.wav.mp3  track11.cdda.wav.mp3
track02.cdda.wav.mp3  track07.cdda.wav.mp3  track12.cdda.wav.mp3
track03.cdda.wav.mp3  track08.cdda.wav.mp3  track13.cdda.wav.mp3
track04.cdda.wav.mp3  track09.cdda.wav.mp3
track05.cdda.wav.mp3  track10.cdda.wav.mp3

but we want to rename them so they are like "05.mp3"

#the first "track" is actually a variable name but does not need $ because it is already referenced by the ${track
for track in `ls *.mp3`; do name=${track/track/}; name=${name/.cdda.wav/}; mv $track $name; done

The main part of the code above is the following:

name=${track/track/}


name=${name/.cdda.wav/}

${track is the name of the variable that has the string you want to substitute

/track/ means search for the string "track" in that variable and replace with nothing.

If we had wanted to change it to something else:

name=${track/track/somethingelse}
 

bash, substitutionso, cdda, wav, mp, rename, quot, variable, referenced, ls, mv, substitute, somethingelse,

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