fstab(5)fstab(5)Namefstab - file containing static information about known file systems
The file contains descriptive information about the known file systems.
By convention, is created and maintained as a read-only file by the
system administrator. Each file system is described by its own line
within The order of these lines and the file systems they represent is
important because and sequentially process in the performance of their
The format of each file system description in is as follows:
The meanings of these fields are:
spec The block special file name of the device on which the file
system is located. It can also be a network name for such as
file The pathname of the directory on which the file system is
type How the file system is mounted. The ways in which a file
system can be mounted are:
rw - mount the file system read-write
ro - mount the file system read only
rq - mount the file system read-write with quotas
sw - make the special file part of the swap space
xx - ignore the entry
freq The frequency (in days) with which the command dumps the rw,
ro, and rq file systems.
passno The order in which the command checks the rw, ro, and rq file
systems at reboot time.
name The name of the file system type. File systems can have the
following types: ufs -- ULTRIX file system and nfs -- SUN
Network file system.
options The options field. This field contains an arbitrary string
meaningful only when mounting file systems with the specified
file system type name, such as NFS. The specific options are
described in the reference pages.
Special actions occur for file systems of type sw and rq at system boot
time. File systems of type sw are made part of the swap space by the
command and disk quotas are automatically processed by the command and
then enabled by the command for rq file systems.
Here is a sample file:
The last three entries in the sample shown use NFS options as described
in the reference page.
The passno field of the root file system should be specified as 1.
Other file systems should have larger values. File systems on the same
device should have distinct passno fields. File systems on different
devices may have the identical passno fields to allow them to be simul‐
All field delimiters (:) must exist within each file system descrip‐
tion; only the options field may not be present. However, only the
fields spec and type are meaningful to sw file systems and only the
type field is meaningful to xx file systems.
The file system description within should be parsed only through use of
File system information file
See Alsogetfsent(3x), dump(8), fsck(8), mount(8), mount(8nfs), mount(8ufs) quo‐
tacheck(8), quotaon(8), swapon(8)fstab(5)