Which command is used to display the CPU architecture?

The command used to display the CPU architecture is "uname -m." This command is part of the uname utility, which provides system information about the Linux kernel and hardware. The -m switch specifically returns the machine hardware name, displaying the architecture of the CPU, such as x86_64 for a 64-bit processor or i686 for a 32-bit processor.

Understanding how to use uname is crucial because it provides insights into the underlying hardware that the operating system is running on. This can affect software compatibility, performance tuning, and system configuration, making it an important command for system administrators and users alike.

Other commands related to CPU information may provide different types of data, such as details about the CPU itself, rather than just the architecture. However, "uname -m" is specifically focused on the architecture aspect, which is why it is the correct choice for this question.