man bash --debugger

в начало скрипта

set -x

на freshmeat был bash debugger

всем спасибо. вопрос закрыт.

ddd

Other DDD features include: debugging of programs written in Ada, Bash, C, C++, Chill, Fortran, Java, Modula, Pascal, Perl and Python

BashEclipse

Debugger for Bash version 3(Bourne again shell). Plugin for Eclipse. Will only work with shell script editor ShellEd. http://sourceforge.net/projects/basheclipse/