BASH debugger
This is a complete rewrite of the Korn Shell debugger from Bill Rosenblatt's
`Learning the Korn Shell', published by O'Reilly and Associates (ISBN
1-56592-054-6) with changes by Michael Loukides and Cigy Cyriac. However,
this code now depends on a number of debugging support features that are
neither part of the POSIX standard nor present are in many POSIX-like shells.
Although you can just use bashdb to debug scripts written in BASH, it can
also be used just as a front-end for learning more about programming in
BASH. As an additional aid, the debugger can be used within the context of an
existing script with its functions and variables that have already been
initialized; fragments of the existing code can be experimented with by
changing them inside the debugger.
