tiapp.xml を切り替えるシェルスクリプト書いたし ref: http://qiita.com/items/a2c57d2e3b216033ad8b

build.sh

#! /bin/sh

./tiapp_xml-converter $1
ti build                 # ここは各自でちゃんと書いてね
./tiapp_xml-reverter

env

hostname: my.development.com

file4.txt

var s = Ti.App.Properties.getString('varname');
alert(s); // alert "mystring"

tiapp.xml

<?xml version="1.0" encoding="UTF-8"?>
<ti:app xmlns:ti="http://ti.appcelerator.org">
  ...
  <property name="varname" type="string">mystring</property>
  ...
</ti:app>

tiapp_xml-converter

#! /bin/sh

BUILD_TYPE=$1
if [ -z "$BUILD_TYPE" ]; then
  BUILD_TYPE=production
fi

if [ \
  $BUILD_TYPE != 'development' -a \
  $BUILD_TYPE != 'staging' -a \
  $BUILD_TYPE != 'production' \
]; then
  echo 'the argument should be in [development, staging, production]' 1>&2
  exit 1
fi

if [ $BUILD_TYPE = 'development' -a ! -e env ]; then
  echo "local environment file \"env\" doesn't exist" 1>&2
  exit 1
fi

if [ $BUILD_TYPE = 'development' ]; then
  HOSTNAME=$(cat env | grep 'hostname:' | awk '{print $2}')
elif [ $BUILD_TYPE = 'staging' ]; then
  HOSTNAME=staging.example.com
fi

if [ $BUILD_TYPE != 'production' ]; then
  cp tiapp.xml tiapp.xml.bk
  sed -e "s/<name>\(.*\?\)<\/name>/<name>\1${BUILD_TYPE}<\/name>/" tiapp.xml -i
  sed -e "s/<id>\(.*\?\)<\/id>/<id>\1${BUILD_TYPE}<\/id>/" tiapp.xml -i
  sed -e "s/<property name=\"appenv\" type=\"string\">.*\?<\/property>/<property name=\"appenv\" type=\"string\">${BUILD_TYPE}<\/property>/" tiapp.xml -i
  sed -e "s/<property name=\"hostname\" type=\"string\">.*\?<\/property>/<property name=\"hostname\" type=\"string\">${HOSTNAME}<\/property>/" tiapp.xml -i
fi

tiapp_xml-reverter

#! /bin/sh

if [ -e tiapp.xml.bk ]; then
  mv tiapp.xml.bk tiapp.xml
fi