NAME
  tail - copy the last part of a file

SYNOPSIS
  tail [-f] [-c number|-n number] [file]

DESCRIPTION
  The tail utility shall copy its input file to the standard output beginning at
  a designated place.

  Copying shall begin at the point in the file indicated by
  the -c number or -n number options. The option-argument number shall be counted
  in units of lines or bytes, according to the options -n and -c. Both line and
  byte counts start from 1.

OPERANDS
  file  A pathname of an input file. If no file operand is specified, the
        standard input shall be used.

OPTIONS
  -f  If the input file is a regular file or if the file operand specifies a
      FIFO, do not terminate after the last line of the input file has been
      copied, but read and copy further bytes from the input file when they
      become available. If no file operand is specified and standard input is a
      pipe or FIFO, the -f option shall be ignored. If the input file is not a
      FIFO, pipe, or regular file, it is unspecified whether or not the -f
      option shall be ignored.
  -c  The origin for counting shall be 1; that is, -c +1 represents the first
      byte of the file, -c -1 the last.
  -n  This option shall be equivalent to -c number, except the starting
      location in the file shall be measured in lines instead of bytes. The
      origin for counting shall be 1; that is, -n +1 represents the first line
      of the file, -n -1 the last.