To extract the path and the file name from a fullpath

pathname_manipulation.sh

fullpath_name="/usr/local/a-file-name"
filename1=${fullpath_name##*/}
pathname1=${fullpath_name%/*}
absolute_path=$(readlink -f "$0")

echo $filename1 # return a-file-name
echo $pathname1 # return /usr/local/
echo $absolute_path # return /usr/local/a-file-name

### OR using basename and dirname
filename2=$(basename $fullpath_name)
pathname2=$(dirname $0)
pathname3=$(dirname $absolute_path)

echo $filename2 # return a-file-name
echo $pathname2 #return /usr/local/
echo $pathname3 #return /usr/local/