Show disk usage. The directory defaults to $HOME if the instance is not
specified. The script may be called with an optional argument to set the
alert (defaults to 10 for 10%).
The script also accepts the flag -n to allow checking the disk usage of network devices,
which is disabled by default.
[disk]
command=$SCRIPT_DIR/disk
LABEL=HOME
#DIR=$HOME
#ALERT_LOW=10
interval=30