*BASH User Commands Ubuntu 10.04.4 LTS Server coreutils
TRUNCATE(1)                      User Commands                     TRUNCATE(1)

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

       truncate OPTION... FILE...

       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

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

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

       -r, --reference=FILE
              use this FILE's size

       -s, --size=SIZE
              use this SIZE

       --help display this help and exit

              output version information and exit

       SIZE is a number which may be followed by one  of  the  following  suf-
       fixes:  KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T,
       P, E, Z, Y.

       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.

       Note that the -r and -s options are mutually exclusive.

       Written by Padraig Brady.

       Report truncate bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

       Copyright (C) 2009 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.

       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 7.4                January 2015                      TRUNCATE(1)