Which command will not alter the current directory structure?

The command that will not alter the current directory structure is the one that simply displays information about the current working directory. This command, which is used to print the working directory, provides you with the path of your current location in the filesystem without making any changes to it.

In contrast, commands like "cd" change the current directory by moving you to a new location, "mv" is used to move or rename files or directories, which affects the organization of the filesystem, and "rm" removes files or directories, permanently altering the structure by deleting specified items. Therefore, the command that focuses solely on reporting the current directory without making any modifications to the filesystem structure is the correct choice.