Fast forward-backward (write-read)

[Cousin Stanley]

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 ....


-- 
Stanley C. Kitching
Human Being
Phoenix, Arizona