Two files and one script...
I changed the script slightly.
Have fun...
Bill Hernandez
Plano, Texas
--
+---------+---------+---------+---------+---------+---------+---------+---------+
~/Desktop/bb_test/a.txt
--
+---------+---------+---------+---------+---------+---------+---------+---------+
Ham
Cheese
Tuna
Lettuce
--
+---------+---------+---------+---------+---------+---------+---------+---------+
~/Desktop/bb_test/b.txt
--
+---------+---------+---------+---------+---------+---------+---------+---------+
Salt
Pepper
Vodka
Tuna
--
+---------+---------+---------+---------+---------+---------+---------+---------+
-- script_name : a_minus_b.scpt
--
+---------+---------+---------+---------+---------+---------+---------+---------+
on run
set a_path to (do shell script ("echo " & "~/Desktop/bb_test/a.txt"))
set b_path to (do shell script ("echo " & "~/Desktop/bb_test/b.txt"))
tell application "BBEdit"
open (POSIX file a_path) as alias
set a_props to get properties of text window 1
set a_id to ID of a_props
open (POSIX file b_path) as alias
set b_props to get properties of text window 1
set b_id to ID of b_props
set myOptions to {search mode:grep, starting at top:true, wrap
around:false, backwards:false, case sensitive:false, match words:true, extend
selection:false}
select text window id b_id
set n to count lines of text of text window 1
repeat with counter from 1 to n
select text window id b_id
select line counter of text of text window 1
set search_str to contents of selection
select text window id a_id
replace search_str using "" searching in text 1 of text
window 1 options myOptions
end repeat
end tell
end run
--
+---------+---------+---------+---------+---------+---------+---------+---------+
--
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