uniq - report or filter out repeated lines in a file
uniq [-c|-d|-u] [-f fields] [-s chars]
[input_file[output_file]]
The uniq(1) utility reads the standard input comparing adjacent lines, and writes a copy of each unique input line to the standard output. The second and succeeding copies of identical adjacent input lines are not written. Repeated lines in the input will not be detected if they are not adjacent, so it might be necessary to sort the files first.
The following options are available:
If additional arguments are specified on the command line, the first such argument is used as the name of an input file, and the second is used as the name of an output file.
The uniq(1) utility exits 0 on success, and >0 if an error occurs.
sort(1)
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