fstab(4)                                                 fstab(4)



     NAME
          fstab - static information about filesystems

     SYNOPSIS
          #include <mntent.h>

     DESCRIPTION
          The file /etc/fstab describes the filesystems and swapping
          partitions used by the local machine.  The system
          administrator can modify it with a text editor.  It is read
          by commands that mount, unmount, and check the consistency
          of filesystems; also by the system in providing swap space.
          The file consists of a number of lines like this:
               fsname dir type opts freq passno
          for example:
               /dev/xy0a / 5.2 rw,noquota 1 2

          The entries from this file are accessed using the routines
          in getmntent(3), which returns a structure of the following
          form:

          struct mntent {

              char    *mnt_fsname; /* filesystem name */
              char    *mnt_dir;    /* filesystem path prefix */
              char    *mnt_type;   /* 4.2, 5.2, nfs, swap,
                                      or ignore */
              char    *mnt_opts;   /* rw, ro, noquota, quota,
                                      hard, soft */
              int     mnt_freq;    /* dump frequency, in days */
              int     mnt_passno;  /* pass # on parallel fsck */
          };

          Fields are separated by white space; a ``#'' as the first
          non-white character indicates a comment.

          The mnttype field determines how the mntfsname and
          mntopts fields will be interpreted.  Here is a list of the
          filesystem types currently supported, and the way each of
          them interprets these fields:


        4.2, 5.2
          mnt_fsname     Must be a block special device.

          mnt_opts       Valid options are ro,rw,quota,


        NFS
          mnt_fsname     The path on the server of the directory to be
                         served.




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     fstab(4)                                                 fstab(4)



          mntopts       Valid options are ro,rw,quota,
                         noquota,hard,soft.


        SWAP
          mntfsname     Must be a block special device swap
                         partition.

          mntopts       Ignored.

          If the mnttype is specified as ignore then the entry is
          ignored.  This is useful to show disk partitions not
          currently used.

          The mntfreq and mntpassno fields are currently unused but
          must be present.

          The /etc/fstab file is read only by programs, and never
          written; it is the duty of the system administrator to
          maintain this file.  The order of records in /etc/fstab is
          important because fsck, mount, and umount process the file
          sequentially; filesystems must appear after filesystems they
          are mounted within.

     FILES
          /etc/fstab

     SEE ALSO
          getmntent(3), fsck(1M), mount(1M) .


























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