■ The mount command gives an overview of all mounted devices. To get this information, the /proc/mounts file is read, where the kernel keeps information about all current mounts. It shows kernel interfaces also, which may lead to a long list of mounted devices being displayed.
■ The df -Th command was designed to show available disk space on mounted devices; it includes most of the system mounts. Because it will look on all mounted file systems, it is a convenient command to get an overview of current system mounts. The -h option summarizes the output of the command in a human-readable way, and the -T option shows which file system type is used on the different mounts.
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The output of df is shown in seven columns: ■ Filesystem: The name of the device file that interacts with the disk device that is used. The real devices in the output start with /dev (which refers to the directory that is used to store device files). You can also see a couple of tmpfs devices. These are kernel devices that are used to create a temporary file system in RAM. ■ Type: The type of file system that was used. ■ Size: The size of the mounted device. ■ Used: The amount of disk space the device has in use. ■ Avail: The amount of unused disk space. ■ Use%: The percentage of the device that currently is in use. ■ Mounted on: The directory the device currently is mounted on. Note that when using the df command, the sizes are reported in kibibytes. The option -m will display these in mebibytes, and using -h will use a human-readable format in KiB, MiB, GiB, TiB, or PiB. |
■ The findmnt command shows mounts and the relation that exists between the different mounts. Because the output of the mount command is a bit overwhelming, you may like the output of findmnt . Listing 3.2 shows sample output of this command.
