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NAME

       fstab - static information about the filesystems

SYNOPSIS

       #include <fstab.h>

DESCRIPTION

       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
       comments.   The  order  of  records  in  fstab is important because fsck(8), mount(8), and
       umount(8) sequentially iterate through fstab doing their thing.

       The first field, (fs_spec), describes the block special device or remote filesystem 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 `proc'.

       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.

       The  second  field,  (fs_file),  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), 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
       swapping,  cf.  swapon(8).  An entry ignore causes the line to be ignored.  This is useful
       to show disk partitions which are currently unused.  An entry none is useful for  bind  or
       move mounts.

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

       It  is  formatted  as a comma separated list of options.  It contains at least the type of
       mount plus any additional options appropriate to the filesystem type.   For  documentation
       on the available options for non-nfs file systems, see mount(8).  For documentation on all
       nfs-specific options have a look at nfs(5).  Common for all types of file system  are  the
       options  ``noauto''  (do not mount when "mount -a" is given, e.g., at boot time), ``user''
       (allow a user to mount), and ``owner'' (allow device  owner  to  mount),  and  ``comment''
       (e.g.,  for use by fstab-maintaining programs).  The ``owner'' and ``comment'' options are
       Linux-specific.  For more details, see mount(8).

       The fifth field, (fs_freq), 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), 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 getmntent(3).

FILES

       /etc/fstab

SEE ALSO

       getmntent(3), mount(8), swapon(8), fs(5), nfs(5)

HISTORY

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

AVAILABILITY

       This  man  page  is  part  of  the   util-linux-ng   package   and   is   available   from
       ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.