Re: Preloading capability in linux ??///

[Raju Mathur <raju@xxxxxxxxxxxxxxx>]

>>>>> "Anmol" == Anmol Khirbat <anmol@xxxxxxxxxxx> writes:

    Anmol> On Fri, 24 Nov 2000, Anand Kumria wrote:
    >> On Thu, Nov 23, 2000 at 09:04:32AM -0800, Anmol Khirbat wrote:
    >> > On Thu, 23 Nov 2000, Anand Kumria wrote: > > > Do you want to
    >> create a bit-for-bit disk copy/image? I'd recommend > > dd(1)
    >> then.  > > What does dd do that cat can't do ?
    >> 
    >> $ man 1 cat | head cat - concatenate files and print on the
    >> standard output $ man 1 dd | head dd - convert and copy a file
    >> 
    >> dd can read and write a file in blocks thus speeding up the
    >> transfer whereas cat relies on the underlying C library to do
    >> it I/O.

    Anmol> Show me a program that doesn't use the "underlying C
    Anmol> library" to do I/O.

I think he meant it uses the C buffered I/O functions (fopen & co).
Unbuffered I/O functions (open & co) in C on Linux are just wrappers
around the system calls.

Regards,

-- Raju

    >> dd can also convert from ascii to ebcdic, and do quite a few
    >> other things. the man page is illuminating.

    Anmol> Whats all this got to do with a "bit-for-bit" disk copy?

    Anmol> bye :) Anmol