3.4.6. nv - create, set or remove non volatile (NV) variables Usage

nv [-r] VAR[=VALUE] ... Synopsis

Add a new non volatile (NV) variable named VAR, optionally set to VALUE. NV variables are persistent variables that overwrite the global variables of the same name. Their value is saved implicitly with ‘saveenv’ or explicitly with ‘nv -s’ Options

-r VAR1 ...
remove NV variable(s)
-s save NV variables