diff --git a/plugins/network/tc_ b/plugins/network/tc_
index a870bf3c..3b373434 100755
--- a/plugins/network/tc_
+++ b/plugins/network/tc_
@@ -9,17 +9,17 @@
 # Magic markers (optional - used by munin-config and some installation
 # scripts):
 #
-#%# family=manual
+#%# family=auto
 #%# capabilities=autoconf suggest
 
 
 DEVICE=${0##*/tc_}
 
 mytc() {
-	/sbin/tc -s class show dev $1 | tr "\n" "|" | sed "s/ \+/ /g" | sed "s/ |/|/g" | sed "s/| /|/g" | sed "s/||/\n/g" | sed "s/|/ /g" | tr ":" "_" | grep -v -i sfq | sort -n
+	/sbin/tc -s class show dev "$1" | tr "\n" "|" | sed -e "s/ \+/ /g; s/ |/|/g; s/| /|/g; s/||/\n/g; s/|/ /g" | tr ":" "_" | grep -v -i sfq | sort -n
 }
 
-case $1 in
+case "$1" in
     autoconf)
 	if [ -r /proc/net/dev ]; then
 	    echo yes
@@ -36,13 +36,11 @@ case $1 in
                    split($0, a, /: */);
                    gsub(/^ +/,"",a[1]);
                    if (($2 > 0) || ($10 > 0)) print a[1]; }' /proc/net/dev
-
-#	    egrep '^ *(eth|tap|bond|wlan|ath|ra|sw)[0-9]+:' /proc/net/dev | cut -f1 -d: | sed 's/ //g'
 	fi
 	exit 0
 	;;
     config)
-	echo "graph_order `mytc $DEVICE | awk '{ print $2 "_" $3 }' | tr "\n" " "`"
+	echo "graph_order $(mytc "$DEVICE" | awk '{ print $2 "_" $3 }' | tr "\n" " ")"
 	echo "graph_title $DEVICE TC traffic"
 	echo 'graph_args --base 1000'
 	echo 'graph_vlabel bits per ${graph_period}'
@@ -50,7 +48,7 @@ case $1 in
 	echo "graph_info This graph shows the TC classes traffic of the $DEVICE network interface. Please note that the traffic is shown in bits per second, not bytes."
 
 	# the root(s)
-	mytc $DEVICE | grep -v " parent " | tr "_" " " | awk '{
+	mytc "$DEVICE" | grep -v " parent " | tr "_" " " | awk '{
 	    print $2 "_" $3 "_" $4 ".label " $2 "/" $3 ":" $4;
 	    print $2 "_" $3 "_" $4 ".type DERIVE";
 	    print $2 "_" $3 "_" $4 ".min 0";
@@ -58,7 +56,7 @@ case $1 in
 	}'
 	# TODO: only AREASTACK things with no children
 	# the child(s)
-	mytc $DEVICE | grep " parent " | tr "_" " " | awk '{
+	mytc "$DEVICE" | grep " parent " | tr "_" " " | awk '{
 	    print $2 "_" $3 "_" $4 ".label " $2 "/" $3 ":" $4;
 	    print $2 "_" $3 "_" $4 ".type DERIVE";
 	    print $2 "_" $3 "_" $4 ".min 0";
@@ -70,13 +68,13 @@ case $1 in
 esac
 
 # the root(s)
-mytc $DEVICE | grep -v " parent " | awk '{
+mytc "$DEVICE" | grep -v " parent " | awk '{
     split(substr($0, match($0, /[0-9]+ [Bb]ytes/)), a, " ");
     print $2 "_" $3 ".value " a[1];
 }'
 
 # the child(s)
-mytc $DEVICE | grep " parent " | awk '{
+mytc "$DEVICE" | grep " parent " | awk '{
     split(substr($0, match($0, /[0-9]+ [Bb]ytes/)), a, " ");
     print $2 "_" $3 ".value " a[1];
 }'