<http://forum.pspad.com/read.php?f=2&i=10245&t=10146> 
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@Jan:

Tail is a Unix program that shows the end of a file, used for log files to
see the last lines.
Tail -f follows the end of a file, the next lines are a part of an old
Unix system Man page of tail explaning option f.

     f    If the input file is not a pipe, do not terminate after
          the  line  of the input file has been copied, but enter
          an  endless  loop,  sleeping  for  a  second  and  then
          attempting  to  read  and copy further records from the
          input file.  This option may be  used  to  monitor  the
          growth  of  a  file that is being written by some other
          process.  For example, the command:

               tail -f fred

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