The second
lists the mount point, the third indicates the filesystem type. The line
beginning by proc is a special filesystem. Notice that the swap partition
(/dev/hda3 in the example) has no mount point, so the mount point column
contains none.
The last three columns may require some explanation.
The fifth column is used by the dump utility to decide when to back up the
filesystem. In most cases, you can put 0 here.
The sixth column is used by fsck to decide in what order to check
filesystems when you boot the system. The root filesystem should have a 1
in this field, filesystems that don't need to be checked (such as the swap
partition) should have a 0, and all other filesystems should have a 2.
It's worth noting that the swap partition isn't exactly a filesystem in
the sense that it does not contain files and directories but is just used
by the Linux kernel as secondary memory. However, for historical reasons,
the swap partitions are still listed in the same file as the filesystems.
Column four contains one or more options to use when mounting the
filesystem.
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