(ddd.info)Bash

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C.2 Using DDD with Bash
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BASH support is rather new. As a programming language, BASH is not
feature rich: there are no record structures or hash tables (yet), no
pointers, package variable scoping or methods. So much of the data
display and visualization features of DDD are disabled.

   As with any scripting or interpreted language like Perl, stepping a
machine-language instructions (commands Stepi/Nexti) doesn't exist.

   Some BASH settings are essential for DDD to work correctly.  These
settings with their correct values are:

     set annotate 1
     set prompt set prompt bashdb$_Dbg_less$_Dbg_greater$_Dbg_space

   DDD sets these values automatically when invoking BASH; if these
values are changed, there may be some malfunctions.

   Pay special attention when the prompt has extra angle brackets (a
nested shell) or has any parenthesis (is in a subshell). Quitting may
merely exit out of one of these nested (sub)shells rather than leave
the program.