\fBupsrw\fR allows you to view and change the read/write variables inside your UPS\&. It sends commands via the server \fBupsd\fR(8) to your driver, which configures the hardware for you\&.
.sp
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\&.
.SH"OPTIONS"
.PP
\fB\-h\fR
.RS4
Display the help message\&.
.RE
.PP
\fB\-s\fR\fIvariable\fR
.RS4
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:
.sp
.ifn\{\
.RS4
.\}
.nf
\-s input\&.transfer\&.high=129
.fi
.ifn\{\
.RE
.\}
.sp
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\(cqs available in your hardware\&.
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\(cqt specify \-u on the command line\&. NUT usernames are defined in
\fBupsd.users\fR(5), and are not linked to system usernames\&.
.RE
.PP
\fB\-p\fR\fIpassword\fR
.RS4
Set the password to authenticate to the server\&. This is also optional like \-u, and you will be prompted for it if necessary\&.
.RE
.PP
\fIups\fR
.RS4
View or change the settings on this UPS\&. The format for this option is
upsname[@hostname[:port]]\&. The default hostname is "localhost"\&.
.RE
.SH"UNATTENDED MODE"
.sp
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\&.
.sp
This is not necessary when displaying the list, as the username and password are not required for read\-only mode\&.
\fBupsrw\fR can\(cqt set variables on your UPS unless you provide a valid username and password\&. If you get "access denied" errors, make sure that your \fBupsd.users\fR(5) has an entry for you, and that the username you are using has permissions to SET variables\&.
When using \fBupsrw\fR to modify a numeric float value, that values must be given using decimal (base 10) english\-based representation, so using a dot, in non\-scientific notation\&. So hexadecimal, exponents, and comma for thousands separator are forbiden\&. For example: "1200\&.20" is valid, while "1,200\&.20" and "1200,20" are invalid\&.
