Dynamic changes / init file?

Is there any way to bypass changing the init file to make a dynamic change?
I have to make a change for archiving, and I can't bounce the db right now.
10.2.0.3, HPUX itanium
changes that need to be made...
log_archive_config DG_CONFIG=(peregrine,swesc)
log_archive_dest_state_2 = DEFER
fal_client peregrine
fal_server swesc
I don't really want to just issue these at the command line unknowing if they would do as I want or cause adverse affects.
Is it possible to just rip the command, and update the file too? command line causing immediate change, and init file change will allow for keeping it when restarted...
Thanks

alter system set <parameter> = <value>;defaults to memory assuming that they are immediately modifiable
otherwise
alter system set <parameter> = <value> scope = memory;should do the trick as well. You probably want to use a spfile that way you can do both at the same time:
alter system set <parameter> = <value> scope = both;

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