diff --git a/usr.sbin/zzz/zzz.sh b/usr.sbin/zzz/zzz.sh
index ef9527bb76b3..d4311ac82302 100644
--- a/usr.sbin/zzz/zzz.sh
+++ b/usr.sbin/zzz/zzz.sh
@@ -1,43 +1,43 @@
 #!/bin/sh
 #
 # Suspend the system using either ACPI or APM.
 # For APM, "apm -z" will be issued.
 # For ACPI, the configured suspend state will be looked up, checked to see
 # if it is supported, and "acpiconf -s <state>" will be issued.
 #
 # Mark Santcroos <marks@ripe.net>
 #
 # $FreeBSD$
 
 PATH=/sbin:/usr/sbin:/usr/bin:/bin
 
 ACPI_SUSPEND_STATE=hw.acpi.suspend_state
 ACPI_SUPPORTED_STATES=hw.acpi.supported_sleep_state
 APM_SUSPEND_DELAY=machdep.apm_suspend_delay
 
 # 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
 elif sysctl $APM_SUSPEND_DELAY >/dev/null 2>&1; then
 	# Execute APM style suspend command
 	exec apm -z
 else
 	echo "Error: no ACPI or APM suspend support found."
 fi
 
 exit 1