bashdb, kshdb, and zshdb are debuggers for Bash,
ksh, and zsh scripts respectively. The debugger
command interface is modeled on the gdb command
interface. Front-ends supporting bashdb include
GNU-Emacs and ddd.
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Three features were added. Syntax highlighting of source text is now supported if pygments is installed. There is also an easy way to evaluate the line of code that is about to be executed or the expression part of conditional statements. You can go into a nested shell that imports existing variables and function names. Numerous little bugs were fixed. The code was refactored to support maintenance and future growth.