NAME

     shrinkfile - shrink a file on a line boundary

SYNOPSIS

     shrinkfile [ -n ] [ -m maxsize ] [ -s size ] [ -v ] file...

DESCRIPTION

     The shrinkfile program shrinks files to a given size if  the
     size is larger than maxsize,
      preserving the data at the end of the file.  Truncation  is
     performed  on  line  boundaries, where a line is a series of
     bytes ending with a newline, \n.  There is  no  line  length
     restriction and files may contain any binary data.

     Temporary files are created in the /var/tmp directory.   The
     ``TMPDIR''  environment  variable  may  be used to specify a
     different directory.

     A newline will be added to any non-empty file that does  not
     end  with  a  newline.   The  maximum  file size will not be
     exceeded by this addition.

OPTIONS

     -s   By default, size is assume to be  zero  and  files  are
          truncated  to  zero  bytes.  By default, maxsize is the
          same as size.  If maxsize is less than size, maxsize is
          reset  to  size.  The ``-s'' flag may be used to change
          the truncation size.   Because  the  program  truncates
          only  on line boundaries, the final size may be smaller
          then the specified truncation size.  The size and  max-
          size  parameter  may end with a ``k'', ``m'', or ``g'',
          indicating kilobyte (1024), megabyte (1048576) or giga-
          byte  (1073741824) lengths.  Uppercase letters are also
          allowed.  The maximum file size is 2147483647 bytes.

     -v   If the ``-v'' flag is used, then shrinkfile will  print
          a status line if a file was shrunk.

     -n   If the ``-n'' flag is used, then shrinkfile will exit 0
          if  any  file  is larger than maxsize and exit 1 other-
          wise.  No files will be altered.

EXAMPLES

     Example usage:

          shrinkfile -s 4m curds
          shrinkfile -s 1g -v whey
          shrinkfile -s 500k -m 4m -v curds whey
          if shrinkfile -n -s 100m whey; then echo whey is way too big; fi

HISTORY

     Written by Landon Curt Noll <chongo@toad.com> and Rich  $alz
     <rsalz@uunet.uu.net> for InterNetNews.