TAP_NAME=i4napps-atlassian-cli
# find out what's the tap directory
TAP_DIR="$(brew --repository)/Library/Taps/${TAP_NAME}"
# clone the formula repository to tap directory
git clone --quiet ssh://git@stash.i4napps.com.au/mobile/i4napps-atlassian-cli.git ${TAP_DIR}
# tell brew to repair the taps, that will make brew to pick up newly added tap
brew tap --repair

# install
brew install i4napps-atlassian-cli
# or customized install
ATLAS_USERNAME=i4niac ATLAS_PASSWORD=password brew install i4napps-atlassian-cli

# update
brew update
# then upgrade
brew upgrade i4napps-atlassian-cli
# or customized upgrade
ATLAS_USERNAME=i4niac ATLAS_PASSWORD=password brew upgrade i4napps-atlassian-cli