title: Unix command to replace all instances of a string in every file in a folder
body: <p>I have a folder "model". In it, I need to replace all instances of the term "Test_Dbv3" to "TestDbv3". There are multiple files with names like test_host.hbm.xml, test_host2.hbm.xml, testHost.java, testHost2.java and so on. Is there any way I can possibly do this using a Unix command or a script in any language?</p>
  
  <p>I'm working on RHEL5.</p>