Bash expansions to extract file components and extension from paths

gistfile1.txt

From 
https://stackoverflow.com/questions/965053/extract-filename-and-extension-in-bash

~% FILE="example.tar.gz"

~% echo "${FILE%%.*}"
example

~% echo "${FILE%.*}"
example.tar

~% echo "${FILE#*.}"
tar.gz

~% echo "${FILE##*.}"
gz

and 

filename=$(basename -- "$fullpath")