Work around JRuby shell escaping bug, fix finding worker pids on JRuby

lib/resque/worker.rb

@@ -498,7 +498,7 @@ def worker_pids
     # Returns an Array of string pids of all the other workers on this
     # machine. Useful when pruning dead workers on startup.
     def linux_worker_pids
-      `ps -A -o pid,command | grep [r]esque | grep -v "resque-web"`.split("\n").map do |line|
+      `ps -A -o pid,command | grep "[r]esque" | grep -v "resque-web"`.split("\n").map do |line|
         line.split(' ')[0]
       end
     end
@@ -508,7 +508,7 @@ def linux_worker_pids
     # Returns an Array of string pids of all the other workers on this
     # machine. Useful when pruning dead workers on startup.
     def solaris_worker_pids
-      `ps -A -o pid,comm | grep [r]uby | grep -v "resque-web"`.split("\n").map do |line|
+      `ps -A -o pid,comm | grep "[r]uby" | grep -v "resque-web"`.split("\n").map do |line|
         real_pid = line.split(' ')[0]
         pargs_command = `pargs -a #{real_pid} 2>/dev/null | grep [r]esque | grep -v "resque-web"`
         if pargs_command.split(':')[1] == " resque-#{Resque::Version}"

test/worker_test.rb

@@ -285,6 +285,11 @@ def self.exception
     end
   end
 
+  test "worker_pids returns pids" do
+    known_workers = @worker.worker_pids
+    assert !known_workers.empty?
+  end
+
   test "Processed jobs count" do
     @worker.work(0)
     assert_equal 1, Resque.info[:processed]