How to create file of fixed size?

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# 1  
Old 10-17-2002
How to create file of fixed size?

I want to create a file, that has a fixed size, as a placeholder so no one will write to that disc and I may store backup files at a later date. how can I do this?

Using HP 9000/300 computer with HP 7937 Disc Drives and HPUX 6.5 OS.
# 2  
Old 10-18-2002
you can use dd to do that:
dd if=/dev/zero of=/path/to/desired/big/file count=1024

this example will create a file 1,024 bytes in size.

Last edited by Yogesh Sawant; 02-26-2010 at 02:04 PM.. Reason: added code tags
# 3  
Old 10-18-2002

Iam not sure HP has this command too, at SUN you can use the `mkfile` command

mkfile [-nv] size [k| b| m] filename
# 4  
Old 10-18-2002
HP-UX does not /dev/zero nor mkfile. Modern versions of HP-UX have a command called prealloc which can do this. But I doubt that this command will exist on HP-UX 6.5. I'm pretty sure that will need to upgrade to HP-UX 7.0 before you will have this command available. Smilie

I guess you can just cat several copies of a large file together to make your placeholder.
cat largefile largefile largefile > placeholder
Since your disks are only 571 MB this shouldn't take long.

BTW, I once lifted an enclosure with two 7937's and placed it into a shipping container. Smilie

Seriously, why are running a system this old?
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