get dirname/basename and full path of a script in bash

dirname_basename_fullpath_of_script.bash

# This will work even with spaces in the directory name or the script name
# or even if the script is sourced

script_basename=${BASH_SOURCE[0]##*/}
# on osx you need to brew install coreutils - then  you get greadlink not readlink as in linux
script_fullpath=$( (greadlink -f "${BASH_SOURCE[0]}" || readlink -f "${BASH_SOURCE[0]}" ) 2> /dev/null)
script_dirname=${script_fullpath%/*}

echo basename \'${script_basename}\'
echo fullpath \'${script_fullpath}\'
echo dirname \'${script_dirname}\'