NAME

       upsrw - UPS variable administration tool

SYNOPSIS

       upsrw ups

       upsrw -h

       upsrw -s variable [-u username] [-p password] ups

DESCRIPTION

       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.

OPTIONS

       -h
           Display the help message.

       -s variable
           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 example:

               -s input.transfer.high=129

           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. Others may be
           within an allowed range of values. Refer to the list to know what’s available in your
           hardware.

       -u username
           Set the NUT 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. NUT usernames are defined in upsd.users(5), and are not linked to system
           usernames.

       -p password
           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 "localhost".

UNATTENDED MODE

       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.

       Moreover, if you run this program inside a shell script or similar, you should only
       consider using output from stdout, not stderr.

DIAGNOSTICS

       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.

HISTORY

       This program used to be called upsct2, which was ambiguous and confusing.

SEE ALSO

       upsd(8), upscmd(8)

   Internet resources:
       The NUT (Network UPS Tools) home page: http://www.networkupstools.org/