echo $PWD shows the current directory
echo $OLDPWD shows the most recently visited directory
cd - takes you to the last directory that you were.
in any directory (.) refers to the current directory and (..) refers to the parent direstory
thus cd . let's you remain in the current directory
cd .. takes you to the parent directory
echo $OLDPWD shows the most recently visited directory
cd - takes you to the last directory that you were.
in any directory (.) refers to the current directory and (..) refers to the parent direstory
thus cd . let's you remain in the current directory
cd .. takes you to the parent directory
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