gets Access Logs of given Amazon ELB
it uses user environment as aws credentials
AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_DEFAULT_REGION
or AWS_PROFILE
npm install -g elblogs
elblogs [accountId] [bucket] [lbName (--all for all)] [from ms|Date(ex: YYYY-MM-DDTHH:MM)] [to ms|Date(ex: YYYY-MM-DDTHH:MM) -optional]
$ elblogs 123456789012 elblogs-web --all 1h 30m