I am using this cmd line to download latest build artifact from Bamboo

wget --http-user='denist@bzgint.com' --http-password=****** 'https://beezag.jira.com/builds/rest/api/latest/plan?os_authType=basic'

following instructions here http://confluence.atlassian.com/display/BAMBOO/Using+the+Bamboo+REST+APIs