On Thu, Nov 11, 2010 at 1:42 PM, Tha.Suresh <[email protected]> wrote:
> Create a file of a given size in linux
>
> $ truncate -s 10M file
>
> if the fs support sparse file,using truncate can create sparse file.
>
> more info:
>
> http://en.wikipedia.org/wiki/Sparse_file
>
> $ man truncate
>
It is very useful in virtualization?
qemu for instance.
$ qemu-img create filestore.bin 40G
I can only see truncate(2) in section 2 of the man page in OpenBSD.
Too bad.TRUNCATE(2) OpenBSD Programmer's Manual
TRUNCATE(2)
NAME
truncate, ftruncate - truncate or extend a file to a specified length
SYNOPSIS
#include <unistd.h>
int
truncate(const char *path, off_t length);
int
ftruncate(int fd, off_t length);
DESCRIPTION
truncate() causes the file named by path or referenced by fd to be
truncated or extended to length bytes in size. If the file was larger
than this size, the extra data is lost. If the file was smaller than
this size, it will be extended as if by writing bytes with the value
zero. With ftruncate(), the file must be open for writing.
-Girish
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