# 2.11BSD#431 - /usr/man/cat8/mount.0

    MOUNT(8)	    UNIX Programmer's Manual		 MOUNT(8)

    NAME
         mount - mount file systems

    SYNOPSIS
         mount [ -adfruvw ] [ -t ufs | external_type ]
         mount [ -dfruvw ] special | node
         mount [ -dfruvw ] [ -o options ] [ -t ufs | external_type ]
         special node

    DESCRIPTION
         The mount command calls the mount(2) system call to prepare
         and graft a special device on to the file system tree at the
         point node.  If either special or node are not provided, the
         appropriate information is taken from the fstab(5) file.

         The system maintains a list of currently mounted file sys-
         tems.  If no arguments are given to mount, this list is
         printed.

         The options are as follows:

         -a        Causes everything to be done except for the actual
    	       system call.  This option is useful in conjunction
    	       with the

         -v        flag to determine what the mount command is trying
    	       to do.

         -f        Forces the revocation of write access when trying
    	       to downgrade a filesystem mount status from read-
    	       write to read-only.  For 2.11BSD this flag is
    	       currently not implemented.

         -o        Options are specified with a -o flag followed by a
    	       comma separated string of options.  The following
    	       options are available:

    	       async	 All I/O to the file system should be
    			 done asynchronously.

    			 This is a dangerous flag to and should
    			 not be used unless system should your
    			 system crash.

    	       force	 The same as -f; forces the revocation of
    			 write access when trying to downgrade a
    			 filesystem mount status from read-write
    			 to read-only.	 This is not (and likely
    			 never will be) supported in 2.11BSD.

    Printed 11/24/99	November 16, 1996			1

    MOUNT(8)	    UNIX Programmer's Manual		 MOUNT(8)

    	       noaccesstime
    			 File access times are not updated.

    			 This is a performance optimization for
    			 read-only, short-lived data, e.g., news.

    	       noauto	 This filesystem should be skipped when
    			 mount is run with the -a flag.

    	       na	 Same as noauto.

    	       nodev	 Do not interpret character or block spe-
    			 cial devices on the file system.  This
    			 option is useful for a server that has
    			 file systems containing special devices
    			 for architectures other than its own.

    	       noexec	 Do not allow execution of any binaries
    			 on the mounted file system.  This option
    			 is useful for a server that has file
    			 systems containing binaries for archi-
    			 tectures other than its own.

    	       nosuid	 Do not allow set-user-identifier or
    			 set-group-identifier bits to take
    			 effect.

    	       rdonly	 The same as -r; mount the file system
    			 read-only (even the super-user may not
    			 write it).

    	       sync	 All I/O to the file system should be
    			 done synchronously.

    	       update	 The same as -u; indicate that the status
    			 of an already mounted file system should
    			 be changed.

    	       Any additional options specific to a filesystem
    	       type that is not one of the internally known types
    	       (see the -t option) may be passed as a comma
    	       separated list; these options are distinguished by
    	       a leading - (dash).  Options that take a value are
    	       specified using the syntax -option=value.  At
    	       present no 2.11BSD mount options use the following
    	       form, the example has been retained for illustra-
    	       tive purposes only.  For example, the mount com-
    	       mand:

    	       mount -t mfs -o nosuid,-N,-s=4000 /dev/dk0b /tmp

    Printed 11/24/99	November 16, 1996			2

    MOUNT(8)	    UNIX Programmer's Manual		 MOUNT(8)

    	       causes mount to execute the equivalent of:

    	       /sbin/mount_mfs -o nosuid -N -s 4000 /dev/dk0b
    	       /tmp

           -r	 The file system is to be mounted read-only.
    		 Mount the file system read-only (even the
    		 super-user may not write it).	The same as the
    		 ``rdonly'' argument to the -o option.

           -t "ufs | external type"
    		 The argument following the -t is used to indi-
    		 cate the file system type.  The type ufs is the
    		 default.  Ufs is also the only value supported
    		 by 2.11BSD other than swap.  Thus the -t will
    		 rarely be used.  The -t option can be used to
    		 indicate that the actions should only be taken
    		 on filesystems of the specified type.	More than
    		 one type may be specified in a comma separated
    		 list.	The list of filesystem types can be pre-
    		 fixed with ``no'' to specify the filesystem
    		 types for which action should not be taken.  For
    		 example, the mount command:

    		 mount -a -t nonfs,mfs

    		 mounts all filesystems except those of type NFS
    		 and MFS.

    		 If the type is not one of the internally known
    		 types, mount will attempt to execute a program
    		 in /sbin/mount_XXX where XXX is replaced by the
    		 type name.  For example, mfs filesystems are
    		 mounted by the program /sbin/mount_mfs.

           -u	 The -u flag indicates that the status of an
    		 already mounted file system should be changed.
    		 Any of the options discussed above (the -o
    		 option) may be changed; also a file system can
    		 be changed from read-only to read-write or vice
    		 versa.  An attempt to change from read-write to
    		 read-only will fail if any files on the filesys-
    		 tem are currently open for writing unless the -f
    		 flag is also specified.  This is currently not
    		 implemented in 2.11BSD.  The ability to change
    		 the flags (nodev, nosuid, etc) is however sup-
    		 ported.  The set of options is determined by
    		 first extracting the options for the file system
    		 from the fstab table, then applying any options
    		 specified by the -o argument, and finally apply-
    		 ing the -r or -w option.

    Printed 11/24/99	November 16, 1996			3

    MOUNT(8)	    UNIX Programmer's Manual		 MOUNT(8)

           -v	 Verbose mode.

           -w	 The file system object is to be read and write.

    FILES
         /etc/fstab
    	       file system table

    SEE ALSO
         mount(2), fstab(5), umount(8)

    BUGS
         It is possible for a corrupted file system to cause a crash.

         mount and this manpage were ported from 4.4BSD-Lite to
         2.11BSD to gain the ability to set the various flags such as
         nodev, nosuid and so on.	Multiple filesystem types are not
         supported and several of the options and flags are not
         implemented.

    HISTORY
         A mount command appeared in Version 6 AT&T UNIX.

    Printed 11/24/99	November 16, 1996			4

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