changed systemctl check for command -v

pandora_agents/unix/pandora_agent_installer

@@ -166,7 +166,7 @@ uninstall () {
 	rm -f  $DESTDIR/etc/newsyslog.d/pandora_agent.conf
 
 	# Remove systemd service if exists
-	if [ `systemctl --v 2> /dev/null | grep systemd | wc -l` != 0 ]
+	if [ `command -v systemctl` ]
 	then
 		PANDORA_AGENT_SERVICE="/etc/systemd/system/pandora_agent_daemon.service"
 		rm -f $PANDORA_AGENT_SERVICE
@@ -482,7 +482,7 @@ install () {
 			fi
 
 			# Create systemd service
-			if [ `systemctl --v 2> /dev/null | grep systemd | wc -l` != 0 ]
+			if [ `command -v systemctl` ]
 			then
 				echo "Creating systemd service for pandora_agent_daemon"