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 Documented in Volume 1 of the UNIX Programmers Manual.

 % uniq filename
  will read filename and compare adjacent lines; ONLY unique adjacent lines 
  are listed to the terminal. uniq requires a SORTED file.

 % uniq -c filename
  provides a count of the number of identical adjacent lines.

 % uniq -d filename
  lists one line for each set of identical adjacent lines, and non-identical
  lines are not listed.

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