diff --git a/public/filter/pty.rb b/public/filter/pty.rb
index 5d0ce7507a..b0bfa88a26 100644
--- a/public/filter/pty.rb
+++ b/public/filter/pty.rb
@@ -59,10 +59,6 @@ def read(&block)
   end
 end
 
-def unescape(str)
-  `echo #{str}`.chomp rescue ''
-end
-
 if __FILE__ == $0
   unless command = ARGV.shift
     $stderr.puts DATA.read
@@ -82,7 +78,6 @@ def unescape(str)
     end
   end
 
-  secrets = secrets.map { |s| [s, unescape(s)] }.flatten
   secrets.uniq.sort_by { |s| -s.length }.each do |secret|
     runner = Filter::StringFilter.new(runner, secret) if secret.length >= 3
   end
diff --git a/public/filter/redirect_io.rb b/public/filter/redirect_io.rb
index c5bd9822f1..a0260fda5d 100644
--- a/public/filter/redirect_io.rb
+++ b/public/filter/redirect_io.rb
@@ -39,10 +39,6 @@ def read(&block)
   end
 end
 
-def unescape(str)
-  `echo #{str}`.chomp rescue ''
-end
-
 if __FILE__ == $0
   secrets = []
 
@@ -57,7 +53,6 @@ def unescape(str)
   end
 
   secrets = secrets.reject { |s| s.length < 3 }
-  secrets = secrets.map { |s| [s, unescape(s)] }.flatten
   secrets = secrets.uniq.sort_by { |s| -s.length }
 
   filter = secrets.inject(Filter::Stdin.new($stdin)) do |filter, secret|