NAME

       vnl-uniq - uniq a log file, preserving the legend

SYNOPSIS

        $ cat colors.vnl
        # color
        blue
        yellow
        yellow
        blue
        yellow
        orange
        orange

        $ < colors.vnl | vnl-sort | vnl-uniq -c
        # count color
              2 blue
              2 orange
              3 yellow

DESCRIPTION

         Usage: vnl-uniq [options] < logfile

       This tool runs "uniq" on a given vnlog dataset. "vnl-uniq" is a wrapper around the GNU
       coreutils "uniq" tool. Since this is a wrapper, most commandline options and behaviors of
       the "uniq" tool are present; consult the uniq(1) manpage for detail. The differences from
       GNU coreutils "uniq" are

       •   The input and output to this tool are vnlog files, complete with a legend

       •   "--zero-terminated" is not supported because vnlog assumes newline-separated records

       •   Only one input is supported (a file on the cmdline or data on standard input), and the
           output always goes to standard output. Specifying the output as a file on the
           commandline is not supported.

       •   "--vnl-count NAME" can be given to name the "count" column. "-c" is still supported to
           add the default new column named "count", but if another name is wanted, "--vnl-count"
           does that. "--vnl-count" implies "-c"

       •   In addition to the normal behavior of skipping fields at the start, "-f" and
           "--skip-fields" can take a negative argument to skip the all but the last N fields.
           For instance, to use only the one last field, pass "-f -1" or "--skip-fields=-1".

       Past that, everything "uniq" does is supported, so see that man page for detailed
       documentation.

BUGS

       This and the other "vnl-xxx" tools that wrap coreutils are written specifically to work
       with the Linux kernel and the GNU coreutils. None of these have been tested with BSD tools
       or with non-Linux kernels, and I'm sure things don't just work. It's probably not too
       effortful to get that running, but somebody needs to at least bug me for that. Or better
       yet, send me nice patches :)

SEE ALSO

       uniq(1)

REPOSITORY

       https://github.com/dkogan/vnlog/

AUTHOR

       Dima Kogan "<dima@secretsauce.net>"

LICENSE AND COPYRIGHT

       Copyright 2019 Dima Kogan "<dima@secretsauce.net>"

       This library is free software; you can redistribute it and/or modify it under the terms of
       the GNU Lesser General Public License as published by the Free Software Foundation; either
       version 2.1 of the License, or (at your option) any later version.

                                            2020-02-04                                VNL-UNIQ(1)