System information

Chapter 18. Using the mo unt Command
On Linux, UNIX, and similar operating systems, file systems on different partitions and removable
devices (CD s, DVDs, or USB flash drives for example) can be attached to a certain point (the mount
point) in the directory tree, and then detached again. To attach or detach a file system, use the mo unt
or umo unt command respectively. This chapter describes the basic use of these commands, as well
as some advanced topics, such as moving a mount point or creating shared subtrees.
18.1. List ing Current ly Mount ed File Syst ems
To display all currently attached file systems, run the mo unt command with no additional arguments:
mo unt
This command displays the list of known mount points. Each line provides important information
about the device name, the file system type, the directory in which it is mounted, and relevant mount
options in the following form:
device on directory type type (options)
The fi nd mnt utility, which allows users to list mounted file systems in a tree-like form, is also
available from Red Hat Enterprise Linux 6.1. To display all currently attached file systems, run the
fi nd mnt command with no additional arguments:
fi nd mnt
18.1.1. Specifying t he File Syst em T ype
By default, the output of the mo unt command includes various virtual file systems such as sysfs
and tmpfs. To display only the devices with a certain file system type, supply the -t option on the
command line:
mo unt -t type
Similarly, to display only the devices with a certain file system type by using the fi nd mnt command,
type:
fi nd mnt -t type
For a list of common file system types, refer to Table 18.1, “ Common File System Types” . For an
example usage, see Example 18.1, “ Listing Currently Mounted ext4 File Systems” .
Examp le 18.1. List in g Cu rren t ly Mo u n t ed ext4 File Syst ems
Usually, both / and /bo o t partitions are formatted to use ext4 . To display only the mount points
that use this file system, type the following at a shell prompt:
~]$ mo unt -t ext4
/dev/sda2 on / type ext4 (rw)
/dev/sda1 on /boot type ext4 (rw)
⁠Chapt er 1 8 . Using t he mount Command
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