If name is defined in non-volatile RAM, replace name's definition string with value. If invoked as sgikopt, more than one name can be given. Only the superuser can set variables.
Different systems have different mixes of volatile and non-volatile variables.
If an attempt to get or set a variable fails for any reason, nvram prints an appropriate message on standard error and exits with non-zero status. Not all systems support the ability to change the contents of non- volatile memory with the nvram command. To change the contents of non- volatile memory on systems that do not support nvram, you must use the PROM monitor setenv command.