Short: Shows the n last lines of a file efficiently

    Tail is a simple utility that outputs just a few of the last lines of any
  file.   It is just like the type command of AmigaDOS, but it types just the
  last  lines of files.  Note that tail is implemented in such a way that the
  input  file  is normally not entirely read from the beginning, to provide a
  better  performance,  specially  for  big files in hard disks or for floppy
  users.   This  is  version 1.0, and includes portable source in C.  Author:
  Bruno Costa.