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Thanks Gary,

I hadn't really thought of that. I'm copying a "read-only" data file to a tmpname before I muck with it so I was thinking in shell operations.

If read/write might be slow, then os.execute's fine. The data might be tens or low hundreds of MB.

On 8/04/2008, at 6:10 PM, gary ng wrote:

what is the problem of read then write other than it
may be a bit slow ?

--- Geoff Leyland <> wrote:


Am I right in thinking there's no os.copy or
lfs.copy for copying
files?  os.execute is the obvious (system dependent)
workaround, but I
thought I'd check there's not a better way.