Gnu/coreutils/truncate-invocation
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14.5 truncate
: Shrink or extend the size of a file
truncate
shrinks or extends the size of each file
to the
specified size. Synopsis:
truncate option… file…
Any file
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 sparse extended part
(or hole) reads as zero bytes.
The program accepts the following options. Also see Common options.
- ‘
-c
’
‘--no-create
’ Do not create files that do not exist.
- ‘
-o
’
‘--io-blocks
’ Treat
size
as number of I/O blocks of thefile
rather than bytes.- ‘
-r rfile
’
‘--reference=rfile
’ Base the size of each
file
on the size ofrfile
.- ‘
-s size
’
‘--size=size
’ Set or adjust the size of each
file
according tosize
.size
is in bytes unless--io-blocks
is specified.size
may be, or may be an integer optionally followed by, one of the following multiplicative suffixes:‘KB’ => 1000 (KiloBytes) ‘K’ => 1024 (KibiBytes) ‘MB’ => 1000*1000 (MegaBytes) ‘M’ => 1024*1024 (MebiBytes) ‘GB’ => 1000*1000*1000 (GigaBytes) ‘G’ => 1024*1024*1024 (GibiBytes)
and so on for ‘
T
’, ‘P
’, ‘E
’, ‘Z
’, and ‘Y
’. Binary prefixes can be used, too: ‘KiB
’=‘K
’, ‘MiB
’=‘M
’, and so on.size
may also be prefixed by one of the following to adjust the size of eachfile
based on its current size:‘+’ => extend by ‘-’ => reduce by ‘<’ => at most ‘>’ => at least ‘/’ => round down to multiple of ‘%’ => round up to multiple of
An exit status of zero indicates success, and a nonzero value indicates failure.
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