|Linux & Unix Commands - Search Man Pages
nvram - manipulate Open Firmware NVRAM variables
nvram [ -p ] [ -f filename ] [ name ] [= value ] ...
The nvram command allows manipulation of Open Firmware NVRAM variables. It can be used to
get or set a variable. It can also be used to print all of the variables or set a list of
variables from a file. Changes to NVRAM variables are only saved by clean restart or
In principle, name can be any string. In practice, not all strings will be accepted. New
World machines can create new variables as desired. Some variables require administrator
privilege to get or set.
The given value must match the data type required for name. Binary data can be set using
the %xx notation, where xx is the hex value of the byte. The type for new variables is
always binary data.
-p Print all of the Open Firmware variables.
Set Open Firmware variables from a text file. The file must be a list name=value
statements. If the last character of a line is \, the value will be continued to
the next line.
example% nvram boot-args="-s rd=*hd:10"
Set the boot-args variable to "-s rd=*hd:10". This would specify single user mode with
the root device in hard drive partition 10.
example% nvram my-variable="String One%00String Two%00%00"
Create a new variable, my-variable, containing a list of two C-strings that is terminated
by a NUL.
December 12, 2000 nvram(8)
All times are GMT -4. The time now is 06:16 AM.