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function: delivers the last part of the file.
If the input-file is not a pipe, the program will not terminate after the line of the input-file has been copied, but will enter an endless loop, wherein it sleeps for a second and then attempts to read and copy further records from the input-file. Thus it may be used to monitor the growth of a file that is being written by some other process.
It is very useful for monitoring log files of server applications - e.g. Apache's error.log and access.log. or IIS, Tomcat, Resin log files.