truncate(1) [freebsd man page]

TRUNCATE(1)						    BSD 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 pre-
	     ceded by a dash (-), file lengths will be reduced by no more than this number of bytes, to a minimum length of zero bytes.  Other-
	     wise, 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 specified.

     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>.

BSD
								 December 19, 2006							       BSD

Check Out this Related Man Page

TRUNCATE(1)							   User Commands						       TRUNCATE(1)

NAME

       truncate - shrink or extend the size of a file to the specified size

SYNOPSIS

       truncate OPTION... FILE...

DESCRIPTION

       Shrink or extend the size of each FILE to the specified size

       A FILE argument that does not exist is created.

       If  a  FILE  is	larger than the specified size, the extra data is lost.  If a FILE is shorter, it is extended and the extended part (hole)
       reads as zero bytes.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --no-create
	      do not create any files

       -o, --io-blocks
	      treat SIZE as number of IO blocks instead of bytes

       -r, --reference=RFILE
	      base size on RFILE

       -s, --size=SIZE
	      set or adjust the file size by SIZE bytes

       --help display this help and exit

       --version
	      output version information and exit

       SIZE is an integer and optional unit (example: 10M is 10*1024*1024).  Units are K, M, G, T, P, E, Z, Y (powers of  1024)  or  KB,  MB,  ...
       (powers of 1000).

       SIZE  may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round
       down to multiple of, '%' round up to multiple of.

       GNU  coreutils  online  help:  <http://www.gnu.org/software/coreutils/>	Report	truncate  translation  bugs   to   <http://translationpro-
       ject.org/team/>

AUTHOR

       Written by Padraig Brady.

COPYRIGHT

       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       dd(1), truncate(2), ftruncate(2)

       The  full  documentation  for truncate is maintained as a Texinfo manual.  If the info and truncate programs are properly installed at your
       site, the command

	      info coreutils 'truncate invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014							       TRUNCATE(1)

Linux and UNIX Man Pages

truncate(1) [freebsd man page]

Check Out this Related Man Page