unix Basic console commands pushd/popd (store current dir on stack and go to dest / pop prev dir and go to it)
Example
$ pwd
/home/bob/somedir1/somedir2/somedir3
$ pushd /home/bob/otherdir1/otherdir2
/home/bob/otherdir1/otherdir2 /home/bob/somedir1/somedir2/somedir3
$ popd
/home/bob/somedir1/somedir2/somedir3
$ pushd /usr
/usr /home/bob/somedir1/somedir2/somedir3
$ pushd /var
/var /usr /home/bob/somedir1/somedir2/somedir3
$ popd
/usr /home/bob/somedir1/somedir2/somedir3
$ pwd
/usr
$ popd
/home/bob/somedir1/somedir2/somedir3
$ pwd
/home/bob/somedir1/somedir2/somedir3
