There are many types of graphic images in this huge archive such as .jpg, .gif, .png, etc. I don't know all the types. Is there a way with 'find' to be able to have it list all the graphic images regardless of their dot extension name? Thanks!
This should do the trick
find . -name '*' -exec file {} \; | grep -o -P '^.+: \w+ image'
example output:
./navigation/doc/Sphärische_Trigonometrie-Dateien/bfc9bd9372f650fd158992cf5948debe.png: PNG image
./navigation/doc/Sphärische_Trigonometrie-Dateien/6564ce3c5b95ded313b84fa918b32776.png: PNG image
./navigation/doc/subr_1.jpe: JPEG image
./navigation/doc/Astroanalytisch-Dateien/Gamma.gif: GIF image
./navigation/doc/Astroanalytisch-Dateien/deltaS.jpg: JPEG image
./navigation/doc/Astroanalytisch-Dateien/GammaBau.jpg: JPEG image