truncate 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

The SIZE argument is an integer and optional unit (example: 10K is
10*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.

AUTHOR

Written by Padraig Brady.

REPORTING BUGS

GNU coreutils online help:
Report truncate translation bugs to

COPRYRIGHT

Copyright © 2016 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, truncate, ftruncate

Full documentation at:
or available locally via: info ‘(coreutils) truncate invocation’

GNU coreutils 8.25 February 2016 TRUNCATE(1)