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".

       •   By default we call the "uniq" tool to do the actual work. If the underlying tool has a different name
           or lives in an odd path, this can be specified by passing "--vnl-tool TOOL"

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

COMPATIBILITY

       I  use  GNU/Linux-based systems exclusively, but everything has been tested functional on FreeBSD and OSX
       in addition to Debian, Ubuntu and CentOS. I can imagine there's something I missed when testing  on  non-
       Linux systems, so please let me know if you find any issues.

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.

                                                   2021-12-30                                        VNL-UNIQ(1)