Pushd

Usefull in scripts when you have do change directory and want to return to where you started.

The directory stack has the current working directory and all directory's pushed on it.

pushd <dir>

Add the current working directory to the stack and change directory to <dir>.

pushd

Pop the last directory from the directory stack, change directory to it and push the current working directory to the stack.

popd

Pop the last directory from the directory stack and change directory to it (return to previous directory).

dirs

Show the current directory and the directory stack