Import:

	* Mute the output of grep in packages/qmp-system/files/etc/uci-defaults/qmp_clamp_tcpmss.
	* Avoid the use of the pipe in packages/qmp-system/files/etc/uci-defaults/qmp_clamp_tcpmss.

packages/qmp-system/files/etc/uci-defaults/qmp_clamp_tcpmss

 #!/bin/sh
+#
+#    Copyright (C) 2011 Fundacio Privada per a la Xarxa Oberta, Lliure i Neutral guifi.net
+#
+#    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 2 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, write to the Free Software Foundation, Inc.,
+#    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+#    The full GNU General Public License is included in this distribution in
+#    the file called "COPYING".
+#
+# Contributors:
+#	Simó Albert i Beltran
+#
 
-if cat /etc/firewall.user | grep -e "^# Clamp MSS TCP rule to fix MTU problems"; then exit 0; fi
+if grep -q -e "^# Clamp MSS TCP rule to fix MTU problems" /etc/firewall.user; then exit 0; fi
 
 cat << EOF >> /etc/firewall.user
 # Clamp MSS TCP rule to fix MTU problems