$ export PUBLIC_KEY=$(cat .keys/public.key)
or
$ export PRIVATE_KEY=$(cat .keys/private.key)
$ printenv | grep "_KEY="
PUBLIC_KEY=...
or
$ printenv | grep "_KEY="
PRIVATE_KEY=...
$ unset PUBLIC_KEY
or
$ unset PRIVATE_KEY
$ export PUBLIC_KEY=$(cat .keys/public.key)
or
$ export PRIVATE_KEY=$(cat .keys/private.key)
$ printenv | grep "_KEY="
PUBLIC_KEY=...
or
$ printenv | grep "_KEY="
PRIVATE_KEY=...
$ unset PUBLIC_KEY
or
$ unset PRIVATE_KEY