topic Re: command to create file with certain size in Operating System - HP-UX

command to create file with certain size

Frank de Vries — Fri, 14 Nov 2003 06:55:42 GMT

I forgot which command (not touch) you can create a file with a certain size

Re: command to create file with certain size

Elmar P. Kolkman — Fri, 14 Nov 2003 06:56:50 GMT

dd is your friend:
dd of= bs=1024 count= if=/dev/zero

Re: command to create file with certain size

Frank de Vries — Fri, 14 Nov 2003 06:59:18 GMT

dd may do the trick, however I was looking for a different command.

Re: command to create file with certain size

Robert-Jan Goossens — Fri, 14 Nov 2003 07:00:19 GMT

Hi,

You can create a file with prealloc,

# prealloc file 10000000 ( 10 mb)

Hope it helps,

Robert-Jan.

Re: command to create file with certain size

Frank de Vries — Fri, 14 Nov 2003 07:03:04 GMT

That's then one, full marks !

Re: command to create file with certain size

Elmar P. Kolkman — Fri, 14 Nov 2003 07:26:59 GMT

You can do it different too, but to create a sparse file. In C it will look like below. Of course things like parameter checking etc. are necessary if you really want to use this...
--- ---
#include
#include

void main(int argc,char **argv)
{
int fd=open(argv[1],O_WRONLY|O_CREAT);
lseek(fd,atoi(argv[2]),SEEK_SET);
close(fd);
}