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)