upsrw - UPS variable administration tool
upsrw -s variable [-u username] [-p password] ups
upsrw allows you to view and change the read/write variables inside
your UPS. It sends commands via the server upsd(8) to your driver,
which configures the hardware for you.
The list of variables that allow you to change their values is based on
the capabilities of your UPS equipment. Not all models support this
feature. Typically, cheaper hardware does not support any of them.
Run upsrw with a UPS identifier to see what will work for you.
-h Display the help message.
Specify the variable to be changed inside the UPS. For
unattended mode such as in shell scripts, use the format
VAR=VALUE to specify both the variable and the value, for
Without this argument, upsrw will just display the list of the
variables and their possible values.
Some variables are strings, and can be set to any value within
the length limit. Others are enumerated types and can only be
set to one of those values. Refer to the list to know what's
available in your hardware.
Set the username for the connection to the server. This is
optional, and you will be prompted for this when using the -s
option if you don't specify -u on the command line.
Set the password to authenticate to the server. This is also
optional like -u, and you will be prompted for it if necessary.
ups View or change the settings on this UPS. The format for this
option is upsname[@hostname[:port]]. The default hostname is
If you run this program inside a shell script or similar to set
variables, you will need to specify all of the information on the
command line. This means using -s VAR=VALUE, -u and -p. Otherwise it
will put up a prompt and your program will hang.
This is not necessary when displaying the list, as the username and
password are not required for read-only mode.
upsrw can't set variables on your UPS unless you provide a valid
username and password. If you get "access denied" errors, make sure
that your upsd.users(5) has an entry for you, and that the username you
are using has permissions to SET variables.
This program used to be called upsct2, which was ambiguous and
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
Mon Jan 22 2007