fstab man page on ElementaryOS

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FSTAB(5)			 File Formats			      FSTAB(5)

       fstab - static information about the filesystems


       The  file fstab contains descriptive information about the various file
       systems.	 fstab is only read by programs, and not written;  it  is  the
       duty  of	 the system administrator to properly create and maintain this
       file.  Each filesystem is described on a separate line; fields on  each
       line are separated by tabs or spaces.  Lines starting with '#' are com‐
       ments, blank lines are ignored. The order of records in fstab is impor‐
       tant  because  fsck(8),	mount(8),  and	umount(8) sequentially iterate
       through fstab doing their thing, though at boot	time  mountall(8)  may
       process the file out-of-order when it believes it is safe to do so.

       The first field (fs_spec).
	      This field describes the block special device or remote filesys‐
	      tem to be mounted.

	      For ordinary mounts it will hold (a link	to)  a	block  special
	      device  node  (as	 created  by  mknod(8))	 for  the device to be
	      mounted, like `/dev/cdrom' or `/dev/sdb7'.  For NFS  mounts  one
	      will have <host>:<dir>, e.g., `knuth.aeb.nl:/'.  For procfs, use

	      Instead of giving the device explicitly, one  may	 indicate  the
	      (ext2  or	 xfs)  filesystem that is to be mounted by its UUID or
	      volume  label  (cf.   e2label(8)	 or   xfs_admin(8)),   writing
	      LABEL=<label>    or    UUID=<uuid>,    e.g.,   `LABEL=Boot'   or
	      `UUID=3e6be9de-8139-11d1-9106-a43f08d823a6'.  This will make the
	      system  more  robust: adding or removing a SCSI disk changes the
	      disk device name but not the filesystem volume label.

	      Note that mount(8) uses UUIDs as strings. The string representa‐
	      tion of the UUID should be based on lower case characters.

       The second field (fs_file).
	      This  field  describes  the mount point for the filesystem.  For
	      swap partitions, this field should be specified  as  `none'.  If
	      the name of the mount point contains spaces these can be escaped
	      as `\040'.

       The third field (fs_vfstype).
	      This field describes the type of the filesystem.	Linux supports
	      lots  of	filesystem  types,  such  as adfs, affs, autofs, coda,
	      coherent, cramfs, devpts, efs, ext2, ext3, hfs,  hpfs,  iso9660,
	      jfs,  minix,  msdos,  ncpfs,  nfs,  ntfs,	 proc, qnx4, reiserfs,
	      romfs, smbfs, sysv, tmpfs, udf, ufs, umsdos, vfat,  xenix,  xfs,
	      and possibly others. For more details, see mount(8).

	      For  the	filesystems currently supported by the running kernel,
	      see /proc/filesystems.

	      An entry swap denotes a file or partition to be used  for	 swap‐
	      ping,  cf.  swapon(8).   An  entry  ignore causes the line to be
	      ignored.	This is useful to show disk partitions which are  cur‐
	      rently unused.  An entry none is useful for bind or move mounts.

	      mount(8) and umount(8) support filesystem subtypes.  The subtype
	      is defined by '.subtype' suffix.	For example 'fuse.sshfs'. It's
	      recommended  to  use subtype notation rather than add any prefix
	      to the first fstab field	(for  example  'sshfs#example.com'  is

       The fourth field (fs_mntops).
	      This  field  describes  the  mount  options  associated with the

	      It is formatted as a comma separated list of options.   It  con‐
	      tains  at	 least	the  type of mount plus any additional options
	      appropriate to the filesystem type.  For	documentation  on  the
	      available mount options, see mount(8).  For documentation on the
	      available swap options, see swapon(8).

	      Basic file system independent options are:

		     use default options: rw, suid, dev, exec,	auto,  nouser,
		     and async.

	      noauto do	 not  mount  when  "mount  -a" is given (e.g., at boot

	      user   allow a user to mount

	      owner  allow device owner to mount

		     for use by fstab-maintaining programs

	      nofail do not report errors for  this  device  if	 it  does  not

       The  mountall(8) program that mounts filesystem during boot also recog‐
       nises additional options that the  ordinary  mount(8)  tool  does  not.
       These  are:  ``bootwait''  which	 can  be applied to remote filesystems
       mounted outside of /usr or /var, without which  mountall(8)  would  not
       hold up the boot for these; ``nobootwait'' which can be applied to non-
       remote filesystems to explicitly instruct mountall(8) not  to  hold  up
       the boot for them; ``optional'' which causes the entry to be ignored if
       the filesystem type is not known	 at  boot  time;  and  ``showthrough''
       which  permits  a mountpoint to be mounted before its parent mountpoint
       (this latter should be used carefully, as it can cause boot hangs).

       The fifth field (fs_freq).
	      This field is used for these filesystems by the dump(8)  command
	      to  determine which filesystems need to be dumped.  If the fifth
	      field is not present, a value of zero is returned and dump  will
	      assume that the filesystem does not need to be dumped.

       The sixth field (fs_passno).
	      This field is used by the fsck(8) program to determine the order
	      in which filesystem checks are done at reboot  time.   The  root
	      filesystem  should be specified with a fs_passno of 1, and other
	      filesystems should have a fs_passno of 2.	 Filesystems within  a
	      drive will be checked sequentially, but filesystems on different
	      drives will be checked at the same time to  utilize  parallelism
	      available in the hardware.  If the sixth field is not present or
	      zero, a value of zero is returned and fsck will assume that  the
	      filesystem does not need to be checked.

       The proper way to read records from fstab is to use the routines getmn‐
       tent(3) or libmount.

       /etc/fstab, <fstab.h>

       mount(8), mountall(8), swapon(8), fs(5), nfs(5), xfs(5), proc(5), getm‐

       The ancestor of this fstab file format appeared in 4.0BSD.

       This  man  page is part of the util-linux package and is available from

util-linux			  August 2010			      FSTAB(5)

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