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

Past that, everything "tail" 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

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.