genfile(1)

NAME
     genfile - generate files of random data

SYNOPSIS
     genfile [-D] [-R] [-S seed] [-c] [-d dirname] [-f] [-g]  [-s
     minsize[-maxsize]] [-v] filename...

AVAILABILITY
     SUNWsamtp

DESCRIPTION
     genfile generates and checks  files  of  random  data.   The
     files  consist  of  records  of  2113  random integers.  The
     record also includes the name of the  file  and  the  record
     number.   In  addition,  a file header is written before the
     data records.  The header contains the file name, the status
     of  the  file (stat(2)), the random number seed and the data
     length.  This format allows the  file  data  to  be  checked
     later knowing only the file name.

     The file is written using  a  buffer  size  of  41  records.
     Using 41 and 2113 (which are prime numbers), avoids perform-
     ing I/O in integer multiples of sector and block sizes.

     File names may be generated by using the regular  expression
     "range"  construction  [x-y].  When such a filename argument
     is used, each range construction, from  right  to  left,  is
     successively incremented.

     For example, the file name file[A-C][0-9] generates the file
     names fileA0 through fileC9.

     Note, you need to "shell escape" the range constructions.

     If one of the files to be  generated  already  exists,  that
     file name is skipped.

OPTIONS
     -D   Set "directio" on the file.

     -R   Allow rewriting of an existing file.

     -Sseed
          Set the random number seed.

     -c   Read and check files.

     -ddirname
          Use dirname as a prefix to the file names.

     -f   Do not report errors.
User Commands                                          genfile(1)

     -g   Generate files.  This is the default action.

     -ssize
          Generate file with data of  length  size.   The  actual
          length  of the file will be size plus the length of the
          file header (168 bytes on SPARC, 156 on  x86)  and  the
          length  of the file name plus one and rounded up to the
          next multiple of four.  For example if size  is  speci-
          fied  as 10 and the file name is /var/file2, the actual
          length of the file would be 190 bytes on a SPARC  plat-
          form and 178 bytes on an x86 platform.

     -sminsize-maxsize
          Generate files with a random data length  between  min-
          size  and maxsize.  The actual file length includes the
          header and file name lengths as above.

     -v   Verbose output.