[bash] Using find command in bash script

I just start to use bash script and i need to use find command with more than one file type.

list=$(find /home/user/Desktop -name '*.pdf') 

this code work for pdf type but i want to search more than one file type like .txt or .bmp together.Have you any idea ?

You can use this:

list=$(find /home/user/Desktop -name '*.pdf' -o -name '*.txt' -o -name '*.bmp')

Besides, you might want to use -iname instead of -name to catch files with ".PDF" (upper-case) extension as well.

If you want to loop over what you "find", you should use this:

find . -type f -name '*.*' -print0 | while IFS= read -r -d '' file; do
    printf '%s\n' "$file"
done

Source: https://askubuntu.com/questions/343727/filenames-with-spaces-breaking-for-loop-find-command