popd:tldr:9a9e8

The "popd" command is a command used in command line interfaces, such as Unix, Linux, and Windows Command Prompt, to remove the last directory from the directory stack (also known as the "pushd" directory stack).

When you use the "pushd" command, it saves the current directory onto a stack and changes the current directory to the specified directory. The "popd" command, on the other hand, removes the top directory from the stack and changes the current directory back to the directory that was previously on top of the stack. In other words, it reverses the most recent "pushd" command.

Here's an example to demonstrate how "pushd" and "popd" work together:

1. Let's assume the current directory is "/home/user/documents".
2. If you execute the command "pushd /home/user/pictures", the current directory will be changed to "/home/user/pictures" and the old current directory "/home/user/documents" will be saved onto the stack.
3. If you then execute the command "pushd /home/user/music", the current directory will be changed to "/home/user/music" and the old current directory "/home/user/pictures" will be saved onto the stack.
4. At this point, the directory stack would look like this: "/home/user/music", "/home/user/pictures", and "/home/user/documents".
5. If you now execute the command "popd", the top directory ("/home/user/music") will be removed from the stack, and the current directory will be changed back to the directory that was previously on top ("/home/user/pictures").
6. If you then execute "popd" again, the top directory ("/home/user/pictures") will be removed from the stack, and the current directory will be changed back to the original directory ("/home/user/documents").

This command can be useful when navigating through directories and switching between different locations in the file system.