redhat man page for shrinkfile

SHRINKFILE(1)						      General Commands Manual						     SHRINKFILE(1)

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, 
.  There is no line length restriction and files may contain any binary data.

       Temporary files are created in the <pathtmp in inn.conf> 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 addi-
       tion.

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 trun-
	      cates only on line boundaries, the final size may be smaller then the specified truncation size.	The size and maxsize parameter may
	      end  with a ``k'', ``m'', or ``g'', indicating kilobyte (1024), megabyte (1048576) or gigabyte (1073741824) lengths.  Uppercase let-
	      ters 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 otherwise.	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.

SEE ALSO
       inn.conf(5)

																     SHRINKFILE(1)