http://www.rudeshko.com/ci/2014/07/20/accessing-build-parameters-from-bash.html

example.bash

#!/usr/bin/env bash

source tc-props.bash

echo "Running on $agent_name"
echo "Deploying $org_app_version to $org_deploy_server..."
# ...

tc-props.bash

#!/usr/bin/env bash
# Dots are replaced by underscores: agent.name -> agent_name

if [[ ! -f $TEAMCITY_BUILD_PROPERTIES_FILE ]]; then
  echo "TeamCity properties file could not be found. Not running within TeamCity?"
  exit 1
fi

while IFS='=' read -r key value; do
    [[ -n $key ]] && printf -v ${key//./_} "${value%% }"
done <<< "`cat "$TEAMCITY_BUILD_PROPERTIES_FILE" | grep -v '^#'`"