In bash, popd is a command used to change the current directory to the directory stored in the directory stack. The directory stack is a list of directories that are maintained by the shell, and pushd is used to add a directory to the stack. When you run popd, the topmost directory on the stack is removed and the shell changes to the next directory in the stack.

Here’s an example of how you can use popd in a bash script:

# Change to a directory
cd /path/to/directory1

# Push the current directory to the directory stack
pushd /path/to/directory2

# Change to a different directory
cd /path/to/directory3

# Change back to the directory stored in the stack
popd

# The current directory is now /path/to/directory2

In this example, cd /path/to/directory1 changes to the directory /path/to/directory1, pushd /path/to/directory2 adds /path/to/directory2 to the directory stack, cd /path/to/directory3 changes to the directory /path/to/directory3, and popd changes back to the directory /path/to/directory2.