What command can you use to check which libraries a program uses?

The command that can be used to check which libraries a program uses is ldd. This command stands for "list dynamic dependencies," and it is specifically designed to display the shared libraries required by a particular executable program or shared library. When you run ldd followed by the name of an executable, it provides a list of the shared libraries that the executable dynamically links with, along with their respective paths. This is particularly useful for troubleshooting library dependencies or ensuring that the necessary libraries are present on the system.

The other commands have different purposes: ls -l is used to list files and directories with detailed information, getfacl retrieves the access control list of files, and chmod is used to change file permissions. None of these commands provide information regarding the libraries utilized by a program. Thus, ldd is the most appropriate choice for identifying which libraries a program uses.