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Code: Here's something I came up with recently -- it's actually an evolution of the idea of pushd and popd, as included in BASH. To quote the POD docs:

cdhistory is a perl script used to implement web-browser style "history" for UNIX shells; as you use the cd command to explore the filesystem, your moves are remembered, and you can go "back" through history, and "forward" again, as you like.

Download the perl script here.