how to pipe pwd into pushd
How can I pipe in the output of pwd to pushd so that I can use pushd on the current directory. I've tried 

    pwd | pushd

and lots of other combinations but nothing seems to work.
how to pipe pwd into pushd
===

How can I pipe in the output of pwd to pushd so that I can use pushd on the current directory. I've tried 

    pwd | pushd

and lots of other combinations but nothing seems to work.