Fast forward-backward (write-read)

[Tim Golden]

On 24/10/2012 08:07, Virgil Stokes wrote:
> On 23-Oct-2012 22:03, Cousin Stanley wrote:
>> Virgil Stokes wrote:
>>
>>> 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 ?
>>    tac is available as a command under linux ....
>>
>>    $ whatis tac
>>    tac (1) - concatenate and print files in reverse
>>
>>    $ whereis tac
>>    tac: /usr/bin/tac /usr/bin/X11/tac /usr/share/man/man1/tac.1.gz
>>
>>    $ man tac
>>
>>    SYNOPSIS
>>      tac [OPTION]... [FILE]...
>>
>>    DESCRIPTION
>>
>>      Write each FILE to standard output, last line first.
>>
>>      With no FILE, or when FILE is -, read standard input.
>>
>>
>>    I only know that the  tac  command exists
>>    but have never used it myself ....
>>
>>
> Unfortunately, I may be forced to process the data on a Windows
> platform; but, thanks Cousin for the Linux tip.

Well, addressing that specific point, tac is available for Windows:

  http://unxutils.sourceforge.net/

No idea how efficient it is...

TJG