Which command displays currently mounted file systems?

The command that displays currently mounted file systems is the one that provides detailed information about the filesystems that are in use on a Linux system. Specifically, the 'mount' command, when executed without arguments, lists all the currently mounted filesystems along with their associated mount points, filesystem types, and mount options. This tool is essential for system administrators to verify the status of file systems and to troubleshoot any potential issues related to file storage and access.

While other commands can provide information about mounted file systems, they serve different purposes. For example, the 'df' command shows disk space usage for each mounted filesystem but primarily focuses on the amount of used and available space rather than just listing mounted filesystems. The 'ls' command is designed for listing files in directories and does not provide any information about mounted filesystems at all. Similarly, the 'cat' command is used for displaying the contents of files, not for listing or managing file systems.

Thus, when needing to view the currently mounted file systems along with their attributes, the 'mount' command is the most appropriate choice.