Is this Maven 1 or Maven 2?
Maven 2

What steps will reproduce the problem?
1. run maven-googlewebtoolkit2-plugin in linux
2. with more than one compile target value
3. generated compile.sh throw error

What is the expected output? What do you see instead?
able to compile multiple compile target in linux with gwt 1.6

What version of the product are you using? On what operating system?
linux, 2.0-RC1

Please provide any additional information below.
Please check ScriptWriterUnix16.java method writeCompilerInvocationScript():
http://code.google.com/p/gwt-maven/source/browse/trunk/maven-googlewebtoolkit2-plugin/src/main/java/com/totsp/mavenplugin/gwt/scripting/ScriptWriterUnix16.java