The Flex ActionScript command-line debugger, fdb, lets you step through and debug ActionScript files used by your Flex applications. Some of these ActionScript files are external class files, and some are generated by the Flex server when it compiles the application.
There can be any number of files per application, but in general Flex generates a single file containing ActionScript statements used in <mx:Script> blocks within the MXML file, and an additional file for each ActionScript class file used by that application.
You can use fdb in any gdb-compatible debugging environment. For example, you can use M-x gdb inside Emacs and specify fdb.exe as the gdb command.
For an overview of the fdb debugger, use the following tutorial command:
(fdb) tutorial
Version 1.5
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