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man find
You will see it supports logical OR and AND,
for example


find $DIRECTORY/$directoryname -name "*.jpg" -o -name "*.jpeg"

Have a look at ImageMagick. The convert program (http://www.imagemagick.org/script/convert.php) is, what you are interested in.

-x -i, rather. The file list has to go right after -i.

You could also read my suggestion...

Try to read about wget (https://www.unix.com/man-pages.php?query=wget&apropos=0&section=1&os=linux)...:)

No, -d means delete. See man tr.

All ascii characters between 128 and 255.

Read from file inputfile, write to file outputfile.

...You do have a backup, right? You're not just running...