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truncate(1) [freebsd man page]

TRUNCATE(1)						    BSD General Commands Manual 					       TRUNCATE(1)

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 <>. BSD
December 19, 2006 BSD

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TRUNCATE(1)							   User Commands						       TRUNCATE(1)

truncate - shrink or extend the size of a file to the specified size SYNOPSIS
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: <> Report truncate translation bugs to <http://translationpro-> AUTHOR
Written by Padraig Brady. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>. 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)

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