setparam
Usage:
setparam [-type byte|short|int|long|float|double|boolean|string]
[-desc <descrip>] [-unit <units>] [-ucd <ucd>]
[-utype <utype>] [-xtype <xtype>]
<pname> <pexpr>
Sets a named parameter in the table to a given value.
The parameter named <pname> is set
to the value <pexpr>,
which may be a literal value or an expression involving
mathematical operations and other parameter names
(using the param$<name> syntax).
By default, the data type of the parameter is determined
by the type of the supplied expression,
but this can be overridden using the -type flag.
The parameter description, units, UCD, Utype and Xtype attributes
may optionally be set using the other flags.