added -r (region) option to kill_instance command

bin/kill_instance

@@ -1,12 +1,35 @@
 #!/usr/bin/env python
-def kill_instance(instance_id):
-    """Kill an instance given it's instance ID"""
-    import boto
-    ec2 = boto.connect_ec2()
-    print "Stopping instance: %s" % instance_id
-    ec2.terminate_instances([instance_id])
+
+import sys
+from optparse import OptionParser
+
+import boto
+from boto.ec2 import regions
+
+
+
+def kill_instance(region, ids):
+    """Kill an instances given it's instance IDs"""
+    # Connect the region
+    ec2 = boto.connect_ec2(region=region)
+    for instance_id in ids:
+        print "Stopping instance: %s" % instance_id
+        ec2.terminate_instances([instance_id])
 
 
 if __name__ == "__main__":
-    import sys
-    kill_instance(sys.argv[1])
+    parser = OptionParser(usage="kill_instance [-r] id [id ...]")
+    parser.add_option("-r", "--region", help="Region (default us-east-1)", dest="region", default="us-east-1")
+    (options, args) = parser.parse_args()
+    if not args:
+        parser.print_help()
+        sys.exit(1)
+    for r in regions():
+        if r.name == options.region:
+            region = r
+            break
+    else:
+        print "Region %s not found." % options.region
+        sys.exit(1)
+
+    kill_instance(region, args)