diff --git a/usr.sbin/zzz/zzz.sh b/usr.sbin/zzz/zzz.sh
--- a/usr.sbin/zzz/zzz.sh
+++ b/usr.sbin/zzz/zzz.sh
@@ -18,18 +18,18 @@
 # Check for ACPI support
 if sysctl $ACPI_SUSPEND_STATE >/dev/null 2>&1; then
 	# Get configured suspend state
-	SUSPEND_STATE=`sysctl -n $ACPI_SUSPEND_STATE `
+	SUSPEND_STATE=$(sysctl -n $ACPI_SUSPEND_STATE)
 
 	# Get list of supported suspend states
-	SUPPORTED_STATES=`sysctl -n $ACPI_SUPPORTED_STATES `
+	SUPPORTED_STATES=$(sysctl -n $ACPI_SUPPORTED_STATES)
 
 	# Check if the configured suspend state is supported by the system
-	if echo $SUPPORTED_STATES | grep $SUSPEND_STATE >/dev/null; then
+	if echo "$SUPPORTED_STATES" | grep "$SUSPEND_STATE" >/dev/null; then
 		# execute ACPI style suspend command
-		exec acpiconf -s $SUSPEND_STATE
+		exec acpiconf -s "$SUSPEND_STATE"
 	else
 		echo -n "Requested suspend state $SUSPEND_STATE "
-		echo -n "is not supported.  "
+		echo -n "is not supported."
 		echo    "Supported states: $SUPPORTED_STATES"
 	fi
 # Check for APM support