Unix 移動所有子目錄下文件到文件夾

you can use find with xargs for this

find /thisdir -type f -name "*.ogg" -print0 | xargs -0 -Imysongs mv -i mysongs /somedir

The -I in the above command tells xargs what replacement string you want to use (otherwise it adds the arguments to the end of the command).

OR
In your command just try to move '{}' after mv command.

find /thisdir -type f -name '*.ogg' -exec mv -i {} /somedir \;