Re: [coreutils] RE: cp command performance

[Pádraig Brady]

Didn't anyone get my previous reply on this.
I'm wondering about my email server now.

Anyway in summary what I said was the
3 commands you presented would perform about the same.

Things to consider.

The deletion/truncation bit will proceed more quickly on some
file system types.

If both files are on the same disk, then cp will
do a lot of disk head seeking between the two during the copy.
Try to put the temporary file on a different disk if possible.

If that is not possible, then try to process/buffer
more at a time. dd may be useful for this, or the `pv`
command which will give you a progress bar as well
as buffer control.

cheers,
Pádraig.