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MKFS(1M)                                                              MKFS(1M)



NAME
       mkfs - construct a file system

SYNOPSIS
       /etc/mkfs special proto

DESCRIPTION
       Mkfs  constructs  a  file system by writing on the special file special
       according to the directions found in the  prototype  file  proto.   The
       prototype  file  contains tokens separated by spaces or new lines.  The
       first token is the name of a file to be copied onto block zero  as  the
       bootstrap program, see bproc(8).  The second token is a number specify-
       ing the size of the created file system.  Typically it will be the num-
       ber  of blocks on the device, perhaps diminished by space for swapping.
       The next token is the number of i-nodes in the i-list.  The next set of
       tokens  comprise  the specification for the root file.  File specifica-
       tions consist of tokens giving the mode, the user-id, the group id, and
       the  initial  contents  of  the file.  The syntax of the contents field
       depends on the mode.

       The mode token for a file is a 6 character string.  The first character
       specifies  the type of the file.  (The characters -bcd specify regular,
       block special, character special  and  directory  files  respectively.)
       The  second character of the type is either u or - to specify set-user-
       id mode or not.  The third is g or - for the  set-group-id  mode.   The
       rest of the mode is a three digit octal number giving the owner, group,
       and other read, write, execute permissions, see chmod(1).

       Two decimal number tokens come after the mode; they  specify  the  user
       and group ID's of the owner of the file.

       If  the file is a regular file, the next token is a pathname whence the
       contents and size are copied.

       If the file is a block or character special file,  two  decimal  number
       tokens follow which give the major and minor device numbers.

       If  the file is a directory, mkfs makes the entries .  and ..  and then
       reads a list of names and (recursively)  file  specifications  for  the
       entries in the directory.  The scan is terminated with the token $.

       If  the  prototype  file  cannot  be  opened and its name consists of a
       string of digits, mkfs builds a file system with a single empty  direc-
       tory  on  it.  The size of the file system is the value of proto inter-
       preted as a decimal number.  The number of i-nodes is calculated  as  a
       function  of  the  filsystem size.  The boot program is left uninitial-
       ized.

       A sample prototype specification follows:

            /usr/mdec/uboot
            4872 55
            d--777 3 1
            usr  d--777 3 1
                 sh   ---755 3 1 /bin/sh
                 ken  d--755 6 1
                      $
                 b0   b--644 3 1 0 0
                 c0   c--644 3 1 0 0
                 $
            $

SEE ALSO
       filsys(5), dir(5), bproc(8)

BUGS
       There should be some way to specify links.



                                                                      MKFS(1M)