Bash: Get Filename, File Extension and Path from Full Path

The following commands will allow you extract various information from the full path of a file.

Part of the information is the filename, the file extension, the file base and the directory it is located in.

# Truncate the longest match of */ from the beginning of the string
filename="${fullpath##*/}";
# Get the sub-string from the start (position 0) to the position where the filename starts
directory="${fullpath:0:${#fullpath} - ${#filename}}";
# Strip shortest match of . plus at least one non-dot char from end of the filename
base="${filename%.[^.]*}";
# Get the sub-string from length of base to end of filename
extension="${filename:${#base} + 1}";
# If we have an extension and no base, it means we do not really have an extension but only a base
if [[ -z "$base" && -n "$extension" ]]; then
  base=".$extension";
  extension="";
fi
echo -e "Original:\t'$fullpath':\n\tdirectory:\t'$directory'\n\tfilename:\t'$filename'\n\tbase name:\t'$base'\n\textension:\t'$extension'"

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