On 23-Oct-2012 19:56, Tim Chase wrote:
On 10/23/12 12:17, Virgil Stokes wrote:
On 23-Oct-2012 18:09, Tim Chase wrote:
Finally, to my question --- What is a fast way to write these
variables to an external file and then read them in
backwards?
Am I missing something, or would the fairly-standard "tac"
utility do the reversal you want? It should[*] be optimized to
handle on-disk files in a smart manner.
Not sure about "tac" --- could you provide more details on this
and/or a simple example of how it could be used for fast reversed
"reading" of a data file?
Well, if you're reading input.txt (and assuming it's one record per
line, separated by newlines), you can just use
tac < input.txt > backwards.txt
which will create a secondary file that is the first file in reverse
order. Your program can then process this secondary file in-order
(which would be backwards from your source).
I might have misunderstood your difficulty, but it _sounded_ like
you just want to inverse the order of a file.
Yes, I do wish to inverse the order, but the "forward in time" file will be in
binary.
--V
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