UTF-8 Text Filter for BBEdit

convert_utf8.sh

#!/bin/bash

# launch AppleScript to retrieve filename of file to 
# be converted and store the result in `file_to_change`

file_to_change=$(/usr/bin/osascript << EOT
tell app "BBEdit"
	set filePath1 to file of document 1
	set filePath2 to POSIX path of filePath1
end
EOT)

# if a value is returned, convert the file to 
# UTF-8 (txt) using textutil

if [ $? -eq 0 ]
then
    /usr/bin/textutil -convert txt $file_to_change
else
    echo "User canceled"
fi

A simple UTF-8 converter for BBEdit. Place the file in the usual location for these things, and make it executable.

And thanks to sakra for the enlightenment on how to run an AppleScript inside bash.