/etc/mtab (help)

The mtab file is a system information file, commonly found on Unix-like systems. This file lists all currently mounted filesystems along with their initialization options. mtab has a lot in common with fstab, the main distinction being that the latter lists all available filesystems whereas the former lists only currently mounted ones. Therefore mtab is usually in a format similar to that of fstab. Most of the time it is possible to directly use lines from mtab in fstab.