onos-* scripts

o usage functions as precursor to more documentable scripts
o `onos-start-network` takes mininet script as parameter
o alias `tail -r` to `tac` for OS X

Change-Id: I88e0fd16ca4b406f4250be88b275eda4d720b5d5
diff --git a/tools/test/bin/onos-check-logs b/tools/test/bin/onos-check-logs
index ec1013a..40e3e10 100755
--- a/tools/test/bin/onos-check-logs
+++ b/tools/test/bin/onos-check-logs
@@ -3,6 +3,25 @@
 # Checks the logs of the remote ONOS instance and makes sure they are clean.
 # -----------------------------------------------------------------------------
 
+function __usage() {
+cat << _EOM_
+
+usage:
+ $(basename $0) [node] ['old']
+
+options:
+ - [node]  : The node whose logs to inspect. The default is \$OCI.
+ - ['old'] : If 'old' is specified, the logs are simply searched for errors
+             and exceptions, and they are displayed.
+
+summary:
+ Checks the logs of the remote ONOS instance and makes sure they are clean.
+
+_EOM_
+}
+
+[ "$1" = "-h" ] && __usage && exit 0
+
 [ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
 . $ONOS_ROOT/tools/build/envDefaults
 
@@ -17,6 +36,7 @@
 
 else
     ssh $remote "
+        [ "'`uname`'" != "'"Linux"'" ] && alias tac='tail -r'
         tac $LOG | awk '
             BEGIN { off = 0; fail = 0; }
             / org.apache.karaf.main.lock.SimpleFileLock lock/ {