+#
+# NEPI, a framework to manage network experiments
+# Copyright (C) 2014 INRIA
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# Author: Alina Quereilhac <alina.quereilhac@inria.fr>
+#
+
+# Example of how to run this experiment (replace with your information):
+#
+# $ cd <path-to-nepi>
+# python examples/planetlab/select_nodes.py -s <pl-slice> -u <pl-user> -p <pl-password> -k <pl-ssh-key> -c <country> -o <operating-system> -n <node-count>
+
+
from nepi.execution.ec import ExperimentController
-from optparse import OptionParser, SUPPRESS_HELP
+from optparse import OptionParser
import os
usage = ("usage: %prog -s <pl-slice> -u <pl-user> -p <pl-password> "