BASH Manual section 6.8: The Directory Stack

dirs -v		# print stack, one per line, indexed from left

pushd		# swap top 2 entries, and cd to new top entry

pushd {dir}	# add {dir} to top of stack, and cd to it

pushd +N	# swap Nth entry with current top, and cd to it

popd		# delete current top of stack, and cd to new top

popd +N		# remove Nth index entry

popd -n		# manipulate stack only; don't change directory