Which command is used to display the current running processes in Linux?

The command that is used to display the current running processes in Linux is indeed "ps." This command provides a snapshot of the current processes, showing information such as the process ID (PID), the terminal associated with the process, the CPU and memory usage, and the command that initiated the process. By default, "ps" shows only processes running in the current shell, but it can be modified with options to display more comprehensive information about processes across the entire system.

While other commands like "top" and "htop" also display running processes, they do so in a more dynamic and interactive manner. "top" provides a live, updating view of processes, allowing users to see real-time changes in process activity, while "htop" offers an enhanced, user-friendly interface with additional features. However, since the question specifically asks for a command that displays processes, "ps" is the foundational command that fulfills this requirement in a straightforward and immediate way. The choice "listprocesses" is not a recognized command in Linux for displaying processes, which makes it an invalid option.