Modified ErrorMsg to accept and optional EXIT argument. This gets rid of most of the sys.exit(1)s that littered the code. ...

Added length constraint checks to newly calculated file/dir names.

Rewrote ProcessIncludes() to properly detect all legal forms of the include option on the command line.

Cleaned up renaming logic to handle old and new stings that contain spaces. ...

Fixed problem with debug option not being properly detected in all cases.

Cleaned up the rename code further when handling -r =something.

Added code to observe reqested case sensitivity when renaming. ...

Added code to handle the case when the old replacement string is null.

Retooled the renaming algorithm in preparation for adding case-insensitivity.

Fixed rename logic to only affect the filename portion of the fully qualified pathname string.

Built basic scaffolding for renaming files. ...

Changed -1 option to -G.
Implemented support for -G, -g.

Modified the contents of ORDERBYCMDLINE and ORDERBYALPHA to use fully qualified filenames.

Retooled the way RenameTargets is structured and populated. ...

Added a separate method to dump RenameTargets for debugging.
Cleaned up bug in ProcessIncludes() that occurred in you included another include without trailing whitespace (-Ix).
Added EXTDELIM, MAXLINELEN, & RENSEP to the ProgramOptions table (like the other options), and adjusted code thoughout to reflect this.

Restructured RenRequests to be a single dictionary that now lives in the RenameTargets class. ...

The old and new strings now appear in the RenRequests dictionary with keys "OLD" and "NEW" respectively.
Defined symbolic constants for accessing state and old, new strings rather than embedding literal strings all over the code.

Changed TGTSEQFLG to a null string so it doesn't show up in debug output.

More cleanup of debug output for command line and environment info.

Repackaged program options into the ProgramOptions dictionary instead of being separate global variables. ...

Cleaned up dump output and integrated the work previously done in DumpRenameObj() into the constructor of the object itself.

Implemented GetOldNew to properly parse a -r old=new arg, honoring RENSEP.

Slight code cleanup and abstraction. ...

Added -R option.

Changed how environment variable and homepage strings are calculated.

Cleaned up Usage() copyright info and added homepage information.

Minor edit to copyright message.

Fixed problem when user specified -I without a space before the filename following as in -Ifile.

Minor cosmetic change to Usage() output.

Added program version info to DumpState() output. ...

General DumpState() cleanup.

Fixed minor typo in Usage(). ...

Added MAXLINELEN to DumpState() output.

Catch os.stat() attempts on nonexistent files. ...

Removed program version number from error and debug output lines.
Added -w to allow user to set length of diagnostic output and reorganized code as needed to do this everywhere.
Removed pair-target command line processing and went back to the standard CLI semantics.

Further slight restructuring of renaming request code.

Factored out a common routine, DumpList(), for dumping any list, using any output handler. ...

Setup the basic structure for parsing renaming requests.

Added deletion of unneeded objects at the end of RenameTargets.__init__()

Added remainder of os.stat() info to RenameTargets for potential sequence renaming token use. ...

Added alpha-order of command line rename targets for potential sequence renaming token use.

More factoring of RenameTargets sequence generations. ...

Added atime and mtime to tracked sequences.

Factored and cleaned up sequence building logic in RenameTargets. ...

Cleaned up DumpRenameObj() accordingly.