diff --git a/confluent_client/bin/nodehealth b/confluent_client/bin/nodehealth
index affafc8e..201eb236 100755
--- a/confluent_client/bin/nodehealth
+++ b/confluent_client/bin/nodehealth
@@ -28,7 +28,11 @@ import confluent.client as client
 
 sys.stdout = codecs.getwriter('utf8')(sys.stdout)
 
-noderange = sys.argv[1]
+try:
+    noderange = sys.argv[1]
+except IndexError:
+    sys.stderr.write('Usage: {0} <noderange>\n'.format(sys.argv[0]))
+    sys.exit(1)
 
 session = client.Command()
 exitcode = 0
@@ -53,9 +57,11 @@ for health in session.read('/noderange/{0}/health/hardware'.format(noderange)):
             for sensor in health[node]['sensors']:
                 explanation = sensor['name'] + ':'
                 if sensor['value'] is not None:
-                    explanation += sensor['value']
+                    explanation += str(sensor['value'])
                     if sensor['units'] is not None:
                         explanation += sensor['units']
+                    if sensor['states']:
+                        explanation += ','
                 if sensor['states']:
                     explanation += ','.join(sensor['states'])
                 healthexplanations[node].append(explanation)
diff --git a/confluent_client/bin/nodeidentify b/confluent_client/bin/nodeidentify
index f8992b32..956827ce 100755
--- a/confluent_client/bin/nodeidentify
+++ b/confluent_client/bin/nodeidentify
@@ -25,8 +25,12 @@ if path.startswith('/opt'):
 
 import confluent.client as client
 
+try:
+    noderange = sys.argv[1]
+except IndexError:
+    sys.stderr.write('Usage: {0} <noderange> [on|off]\n'.format(sys.argv[0]))
+    sys.exit(1)
 
-noderange = sys.argv[1]
 identifystate = None
 if len(sys.argv) > 2:
     identifystate = sys.argv[2]
diff --git a/confluent_client/bin/nodepower b/confluent_client/bin/nodepower
index a9c3cceb..7dbb8722 100755
--- a/confluent_client/bin/nodepower
+++ b/confluent_client/bin/nodepower
@@ -26,7 +26,14 @@ if path.startswith('/opt'):
 import confluent.client as client
 
 
-noderange = sys.argv[1]
+try:
+    noderange = sys.argv[1]
+except IndexError:
+    sys.stderr.write(
+        'Usage: {0} <noderange> ([status|on|off|shutdown|boot|reset]\n'.format(
+            sys.argv[0]))
+    sys.exit(1)
+
 setstate = None
 if len(sys.argv) > 2:
     if setstate == 'softoff':
diff --git a/confluent_client/bin/nodesensors b/confluent_client/bin/nodesensors
index 377d0d89..590321c6 100755
--- a/confluent_client/bin/nodesensors
+++ b/confluent_client/bin/nodesensors
@@ -54,8 +54,11 @@ if options.numreadings:
     repeatmode = options.numreadings
     if options.interval is None:
         options.interval = 1
-
-noderange = args[0]
+try:
+    noderange = args[0]
+except IndexError:
+    argparser.print_usage()
+    sys.exit(1)
 sensors = []
 for sensorgroup in args[1:]:
     for sensor in sensorgroup.split(','):
diff --git a/confluent_client/bin/nodesetboot b/confluent_client/bin/nodesetboot
index 5a770e60..48252047 100755
--- a/confluent_client/bin/nodesetboot
+++ b/confluent_client/bin/nodesetboot
@@ -26,10 +26,18 @@ if path.startswith('/opt'):
 import confluent.client as client
 
 
-noderange = sys.argv[1]
+try:
+    noderange = sys.argv[1]
+except IndexError:
+    sys.stderr.write(
+        'Usage: {0} <noderange> [default|cd|network|setup|hd]\n'.format(
+            sys.argv[0]))
+    sys.exit(1)
 bootdev = None
 if len(sys.argv) > 2:
     bootdev = sys.argv[2]
+    if bootdev in ('net', 'pxe'):
+        bootdev = 'network'
 session = client.Command()
 exitcode = 0
 sys.exit(
diff --git a/confluent_client/confluent/client.py b/confluent_client/confluent/client.py
index d4d0593e..82f1512a 100644
--- a/confluent_client/confluent/client.py
+++ b/confluent_client/confluent/client.py
@@ -43,7 +43,7 @@ def _parseserver(string):
 
 class Command(object):
 
-    def __init__(self, server="/var/run/confluent/api.sock"):
+    def __init__(self, server=None):
         self.connection = None
         if server is None:
             if 'CONFLUENT_HOST' in os.environ:
@@ -62,6 +62,10 @@ class Command(object):
             self.authenticated = True
         else:
             self.authenticated = False
+        if not self.authenticated and 'CONFLUENT_USER' in os.environ:
+            username = os.environ['CONFLUENT_USER']
+            passphrase = os.environ['CONFLUENT_PASSPHRASE']
+            self.authenticate(username, passphrase)
 
     def authenticate(self, username, password):
         tlvdata.send(self.connection,