Which command is used to temporarily mount a filesystem to a Linux virtual directory?

The command that is used to temporarily mount a filesystem to a Linux virtual directory is the mount command. This command allows a user to attach a filesystem found on a device (like a hard disk, CD-ROM, USB drive, etc.) to a specified directory in the existing filesystem hierarchy, effectively making the files on that device accessible under that directory.

When the mount command is executed, the operating system reads the filesystem type and associates it with a designated directory (also known as a mount point). Until the filesystem is unmounted using the umount command, it will remain accessible, which allows for the management and manipulation of files on the mounted filesystem.

The other options serve different purposes: umount is used to unmount filesystems, df displays information about disk space usage on filesystems, and blkid is useful for locating or printing block device attributes. These functions are important in managing filesystems but do not relate directly to the action of temporarily mounting a filesystem.