Shell Programming and Scripting

Yes , thanks it created the list!

But now i don't know how to create a loop to copy the wav files from the list to the image directory

Code:

filename="match"
while read -r line
do

done

i'm missing the command to find the same wav file in the dir from the "match" list (created by

Code:

grep -f

) and then copy to images on to have mirrored png/wav files

Assuming generated your list with grep -vf listA.lst listB.lst or something similar, you can then:-

Code:

grep -vf listA.lst listB.lst | while read file_ref
do
   cp -p wavsdir/$file_ref.wav target_dir
done

The -p flag on the cp will preserve the ownership and timestamp of the file, if that is important to you. You would need to run this as root to be able to do that, unless the id running the script already owns the files.

The | while read file_ref sets up the loop and sets the value of file_ref to each string returned from the grep in tuen, so you can work down the list.


Does that help?

I might have the logic the wrong way round, so you might need to sort out the order of the list files, the grep with or without the -v flag and the source directory and extension for the file being copied. To test it first, put an echo before the cp command, so it looks like this:-

Code:

do
   echo cp -p wavsdir/$file_ref.wav target_dir
done

If I've got it horribly wrong, please post the error messages so I can have another think.


Kind regards,
Robin

It just did the trick!

Thank you for the very educative lesson for a noob like me!

Regards

Excellent. I'm glad it helped. You might need to be careful if you have a loop within a loop, but if you get stuck, let us know and we can try to help again. We all had to start somewhere. You should see some of my early stuff! It's truly horrible, but as it works, there is no point replacing it. Until you know the tricks and options to do things, then you might feel a little lost.

Feel free to ask for more help. It works best if you can explain the overall objective, then have a go & show us how far you have got with code, files and input/output & errors so we can help you grow your skills and then be able to write and support your own code.


Cheers,
Robin

sure i will ,

thanks again

Kind Regards