Update netctl.sh help

.scripts/netctl.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# Control the network interfaces
+# Depends: iproute2, netctl
+
 WIRELESS="wlan0"
 ETHERNET="eth0"
 PROFILE="eth0-dhcp"
@@ -11,19 +14,21 @@ help() {
 
 	cat << EOF
 ${B}NAME${N}
-	netctl.sh - network manager
+	netctl.sh - control the network interfaces
 
 ${B}SYNOPSIS${N}
-	${B}netctl.sh${N} [${U}OPTION${N}] [${U}ARG${N}]
+	${B}netctl.sh${N} [${U}OPTION${N}] [${U}COMMAND${N}]
 
 ${B}OPTIONS${N}
-	${B}-e${N} [${U}ARG${N}]
+	${B}-h${N}	Display usage message and exit.
+
+	${B}-e${N} [${U}STATE${N}]
 		Perform action on ethernet.
 
-	${B}-w${N} [${U}ARG${N}]
+	${B}-w${N} [${U}STATE${N}]
 		Perform action on wireless.
 
-${B}ARGS${N}
+${B}COMMANDS${N}
 	1, on
 		Enable selected option.
 
@@ -35,13 +40,14 @@ EOF
 # Exit if no option is provided
 [ "$#" -eq 0 ] && help && exit 1
 
-# Option handling
 SCRIPT="$(basename "$0")"
+
+# Option handling
 while getopts ':h?e:w:' opt; do
 	case $opt in
 		h)
 			help
-			exit 1
+			exit 0
 			;;
 		e)
 			dev="ethernet"
@@ -89,7 +95,8 @@ case "$1" in
 		[ "$dev" = "ethernet" ] && ethernet 0 || wireless 0
 		;;
 	*)
-		help
+		echo "$SCRIPT: invalid command '$1'"
+		echo "Try '$SCRIPT -h' for more information."
 		exit 1
 		;;
 esac