pushd is one of the [Tclx] extended tcl commands.  It is used to push the current directory onto a directory stack that can be used with cd.  This permits one to keep track of a series of directories one has visited, and then do a popd to get directories off of the stack.
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[KPV] I've never found '''pushd''' to be very useful on DOS/Windows because
of file volumes and how each volume has it's own current directory. Using
'''pushd''' has the unwanted side-affect of likely changing the current 
directory of the volume you're changing to. For example, if the current directory on volume F: is say "''f:\myDirectory''" and I call '''pushd 
f:\temp''' then '''popd''' and sometime later go back to that volume 
via ''f:'', I'll be put into the directory "''\temp''" rather 
than "''\myDirectory''".

In fact, when I do need '''pushd''''s functionality, I end up needing
to call it twice: once to get to the right volume, then to get to the
right directory (and don't forget you'll need to call '''popd''' twice).

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Also see "[pushdpopd.tcl]".
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[Category Command]