School of Computing
and Communications
D35 InfoLab21
Lancaster University
Lancaster, LA1 4WA
United Kingdom
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TRUNCATE
Section: User Commands (1)Updated: September 2011
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NAME
truncate - shrink or extend the size of a file to the specified sizeSYNOPSIS
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
- --help
- display this help and exit
- --version
- 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.
AUTHOR
Written by Padraig Brady.REPORTING BUGS
Report truncate bugs to bug-coreutils@gnu.orgGNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report truncate translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright © 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.shtml>.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.
Index
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