Changing user identification numbers (UIDs) and group identification numbers (GIDs) in the IBM® AIX® operating system (AIX) isn't one of the more exciting tasks a UNIX® administrator can face. But although it's often seen as a dreadful task, it can be an essential job that an administrator must perform to keep systems in sync within the environment. Because changing UIDs and GIDs can cause serious harm to your environment, you must be careful. The most important thing is understanding what your changes do. Then, you can learn how to make the changes correctly and even automate the process with UNIX scripts.
The standard Perl distribution comes with a debugger, although it's really just another Perl program, perl5db.pl. Since it is just a program, I can use it as the basis for writing my own debuggers to suit my needs, or I can use the interface perl5db.pl provides to configure its actions. That's just the beginning, though. read more...
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