Manual Reference Pages  - 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 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
--help display this help and exit
  output version information and exit
SIZE may be (or may be an integer optionally followed by) one of following: 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.


Written by Padraig Brady.


Report truncate bugs to
GNU coreutils home page: <>
General help using GNU software: <>
Report truncate translation bugs to <>


Copyright © 2011 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.


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 8.12.197-032bb TRUNCATE (1) September 2011
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