Automator/Applescript + shell script: grab parent folder name - shell

Question

I have a Automator workflow that utilizes this shell script to grab the name of the directory hosting the file running through this workflow. Later I place that directory name as comment for the file.
for f in "$#"
do
filepath=$(dirname "$f")
dirname=$(basename "$filepath")
echo "$dirname"
done
Whenever I throw multiple files at it though, the directory name gets reflected not once (as I would like to) but times however many files I dropped at it. This then later adds the same comment that many times.
How do I fix that?
EDIT:
I want to try eliminate Automator and go with Applescript + Shell alone.
How do I have the shell return the directory name? Right now it just gives me $dirname in the dialog...
on adding folder items to theWatchedFolder after receiving theDetectedItems
set dirName to do shell script "for f in '$#'
do
filepath=$(dirname '$f')
dirname=$(basename '$filepath')
echo '$dirname'
done"
display alert dirName
end adding folder items to

Answer 1

on adding folder items to thisFolder after receiving added_items
repeat with aFile in added_items
tell application "Finder"
set parentpath to POSIX path of (parent of (aFile) as string)
set comment of aFile to parentpath
end tell
end repeat
end adding folder items to

Answer 2

I would go with an Applescript droplet.
Save this code as an Application.
When you drop files onto it from a single dir or multiple, it will comment each file with it's own original dir.
Then move the file to the listed move folder.
property moveFolder : "Macintosh HD:Users:USERNAME:fooDIR:"
on open theseFiles
repeat with i from 1 to number of items in theseFiles
set this_item to item i of theseFiles
tell application "Finder"
set parentpath to POSIX path of (parent of (this_item) as string)
set comment of this_item to parentpath
end tell
end repeat
tell application "Finder"
move theseFiles to moveFolder
end tell
end open
You could use a choose command to choose where to move the files instead of hard coding but the files may not be always handed of to the droplet in a single batch even though thats how you dropped them on to it. This means the `choose dialog may display multiple times on whats seems a single run.
But the above hopefully gives you a starting place.