/:pushd /tmp | echo "is a no-op"

[Harry Coin]

/:lsb_release -rd
Description: Ubuntu 15.04
Release: 15.04
/:apt-cache policy bash
bash:
  Installed: 4.3-11ubuntu2
  Candidate: 4.3-11ubuntu2
  Version table:
 *** 4.3-11ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status
/:bash --version
GNU bash, version 4.3.30(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
/:popd
bash: popd: directory stack empty
/:pushd /tmp
/tmp /
/tmp:popd
/
/:pushd /tmp | cat
/tmp /
/: # !!! Pipe after pushd fails to change the current directory to /tmp
/:popd
bash: popd: directory stack empty