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TRUNCATE(1)		FreeBSD	General	Commands Manual		   TRUNCATE(1)

NAME
     truncate -- truncate or extend the	length of files

SYNOPSIS
     truncate [-c] -s [+|-]size[K|k|M|m|G|g|T|t] file ...
     truncate [-c] -r rfile file ...

DESCRIPTION
     The truncate utility adjusts the length of	each regular file given	on the
     command-line.

     The following options are available:

     -c	     Do	not create files if they do not	exist.	The truncate utility
	     does not treat this as an error.  No error	messages are displayed
	     and the exit value	is not affected.

     -r	rfile
	     Truncate or extend	files to the length of the file	rfile.

     -s	[+|-]size[K|k|M|m|G|g|T|t]
	     If	the size argument is preceded by a plus	sign (+), files	will
	     be	extended by this number	of bytes.  If the size argument	is
	     preceded by a dash	(-), file lengths will be reduced by no	more
	     than this number of bytes,	to a minimum length of zero bytes.
	     Otherwise,	the size argument specifies an absolute	length to
	     which all files should be extended	or reduced as appropriate.

	     The size argument may be suffixed with one	of K, M, G or T
	     (either upper or lower case) to indicate a	multiple of Kilobytes,
	     Megabytes,	Gigabytes or Terabytes respectively.

     Exactly one of the	-r and -s options must be specified.

     If	a file is made smaller,	its extra data is lost.	 If a file is made
     larger, it	will be	extended as if by writing bytes	with the value zero.
     If	the file does not exist, it is created unless the -c option is speci-
     fied.

     Note that,	while truncating a file	causes space on	disk to	be freed,
     extending a file does not cause space to be allocated.  To	extend a file
     and actually allocate the space, it is necessary to explicitly write data
     to	it, using (for example)	the shell's `>>' redirection syntax, or	dd(1).

EXIT STATUS
     The truncate utility exits	0 on success, and >0 if	an error occurs.  If
     the operation fails for an	argument, truncate will	issue a	diagnostic and
     continue processing the remaining arguments.

SEE ALSO
     dd(1), touch(1), truncate(2)

STANDARDS
     The truncate utility conforms to no known standards.

HISTORY
     The truncate utility first	appeared in FreeBSD 4.2.

AUTHORS
     The truncate utility was written by Sheldon Hearn
     <sheldonh@starjuice.net>.

FreeBSD	9.2		       December	19, 2006		   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | EXIT STATUS | SEE ALSO | STANDARDS | HISTORY | AUTHORS

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