NAME

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

SYNOPSIS

        $ read_temperature | tee temp.vnl
        # temperature
        29.5
        30.4
        28.3
        22.1
        ... continually produces data

        ... at the same time, in another terminal
        $ vnl-tail -f temp.vnl
        # temperature
        28.3
        22.1
        ... outputs data as it comes in

DESCRIPTION

         Usage: vnl-tail [options] logfile logfile logfile ... < logfile

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

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

       •   "-c" is not supported because vnlog really doesn't want to break up lines

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

       •   By default we call the "tail" 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 "tail" 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

       tail(1)

REPOSITORY

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

AUTHOR

       Dima Kogan "<dima@secretsauce.net>"

LICENSE AND COPYRIGHT

       Copyright 2018 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-TAIL(1)