Shell script to convert Numbers file to txt that could imported to Flashcard Deluxe (an iOS app)

Number2Txt for Flashcard Deluxe

#!/bin/bash
#
# Usage:
#   convert.sh ~/Downloads/Cards.numbers
#   (must specify full path)
#

# AppleScript to convert from numbers to csv
osascript -e '
on run argv
    set number_file to item 1 of argv
    set csv_path to (text 1 thru -8 of number_file) & "csv" -- replace name extension

    tell application "Numbers"
        open number_file
        save document 1 as "LSDocumentTypeCSV" in csv_path
        close every window saving no
    end tell
end run
' "$1"

CSV=`echo $1 | sed "s/numbers/csv/"`
TXT=`echo $1 | sed "s/numbers/txt/"`
ruby -e '
  require "csv"
  File.write(ARGV[1], CSV.open(ARGV[0]).map do |line|
    (line[0]+"\t"+line[1]).gsub("\n","|")
  end.join("\n"))
' "$CSV" "$TXT"

rm "$CSV"