Applescript change folder and terminal commands

This uses the built in unix commands to get the Author.

Try it and let me know if it needs a tweak.

tell application "iTunes"

    set sel to the selection

    if sel is {} then display dialog "Please select something" buttons {"Cancel"}

    repeat with i from 1 to count of sel

        set the_track to item i of sel

        set the_posix_path to POSIX path of (location of the_track as alias)

        set authorfield to paragraph 2 of (do shell script "mdls -name kMDItemAuthors " & quoted form of the_posix_path & "|  awk -F\\\" '{print $2'}")

        set artist of the_track to (authorfield & "-") as string
    end repeat


end tell

These examples accomplish what you want. Note the " & quoted form of portName & " portion of the shellString. Was just guessing that's where it goes, but you can figure it out from there.

-- set the porn name to a variable
set portName to do shell script "ls /dev/tty.usb*"

-- set up the shell command, including the variable you insert
set shellString to "/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avrdude -C /Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf -c arduino -P /dev/tty." & quoted form of portnName & " -p atmega1284p -U flash:w:$HOME/Desktop/Zymatic_RC_1_1_9.hex"

-- run the shell command
do shell script shellString

-- this command returns an alias to a folder
set aFolder to choose folder "Please choose the correct folder"
-- this command returns an alias to a file, you can restrict file types
set aFile to choose file "Please choose the correct file"
-- you can convert the folder/file alias to a string to get just the portion you need