uniq(1)

     NAME
          uniq - remove duplicate lines from a sorted file

     SYNOPSIS
          uniq [-cdu] [-f skip-fields] [-s skip-chars] [-w check-
          chars] [-#skip-fields] [+#skip-chars] [--count] [--repeated]
          [--unique] [--skip-fields=skip-fields] [--skip-chars=skip-
          chars] [--check-chars=check-chars] [--help] [--version]
          [infile] [outfile]

     DESCRIPTION
          This documentation is no longer being maintained and may be
          inaccurate or incomplete.  The Texinfo documentation is now
          the authoritative source.

          This manual page documents the GNU version of uniq.  uniq
          prints the unique lines in a sorted file, discarding all but
          one of a run of matching lines.  It can optionally show only
          lines that appear exactly once, or lines that appear more
          than once.  uniq requires sorted input because it compares
          only consecutive lines.

          If the output file is not specified, uniq writes to the
          standard output.  If the input file is not specified, it
          reads from the standard input.

        OPTIONS
          -u, --unique
               Only print unique lines.

          -d, --repeated
               Only print duplicate lines.

          -c, --count
               Print the number of times each line occurred along with
               the line.

          -number, -f, --skip-fields=number
               In this option, number is an integer representing the
               number of fields to skip over before checking for
               uniqueness.  The first number fields, along with any
               blanks found before number fields is reached, are
               skipped over and not counted.  Fields are defined as a
               strings of non-space, non-tab characters, that are
               separated from each other by spaces and tabs.

          +number, -s, --skip-chars=number
               In this option, number is an integer representing the
               number of characters to skip over before checking for
               uniqueness.  The first number characters, along with
               any blanks found before number characters is reached,
               are skipped over and not counted.  If you use both the
               field and character skipping options, fields are
               skipped over first.

          -w, --check-chars=number
               Specify the number of characters to compare in the
               lines, after skipping any specified fields and
               characters.  Normally the entire rest of the lines are
               compared.

          --help
               Print a usage message and exit with a status code
               indicating success.

          --version
               Print version information on standard output then exit.