[U-Boot-Users] Delete all env vars except read onlys

Ulf Samuelsson
2008-02-20T21:30:02Z

>> >
>> > After a longish discussion with Detlev we came up with a new
>> > proposal, which hopefully is acceptable to all. We agreed that a
>> > command name like "clearenv" or "scrubenv" or similar (which doesn't
>> > require any arguments) might be too dangerous for the unexperienced
>> > user why randomly types commands "just to see what happens". For
>> > example, even if you type "erase" it will not do any damage because
>> > arguments are missing - but "erase all" will blow away most of your
>> > flash content without asking.
>> >
>> > So the idea is to call the new command "environment" (or short "env");
>> > usage would be then:
>> >
>> > => env clear
>> >
>> > to clear the envrionment (except read-only variables); thsi also
>> > allows for pretty useful additional functionality like this:
>> >
>> > => env default
>> >
>> > to reset the environment to the (compiled in) default settings.
>> >

I see this as essential and have implemented this in my own u-boot.
I call it "defenv".

It is a little different though, It will reinitialize the predefined environment
variables to default settings but will not touch the other.

If "env default" is implemented the same way, then you could get a
100% clean environment by:

env clear ; env default

What will "env" do without parameters?

Best Regards
Ulf Samuelsson