NAME¶

vnl-ts - add a timestamp to a vnlog stream

SYNOPSIS¶

 $ read_temperature
 # temperature
 29.5
 30.4
 28.3
 22.1
 ... continually produces data at 1Hz
 $ read_temperature | vnl-ts -s %.s
 # time-rel temperature
 0.013893 30.2
 1.048695 28.6
 2.105592 29.3
 3.162873 22.0
 ...

DESCRIPTION¶

  Usage: vnl-ts [-i | -s] [-m] [--vnl-field t] format < pipe

This tool runs "ts" on given vnlog streams. "vnl-ts" is a wrapper around the "ts" tool from Joey Hess's moreutils <https://joeyh.name/code/moreutils/> toolkit. Since this is a wrapper, most commandline options and behaviors of the "ts" tool are present; consult the ts(1) manpage for details. The differences from "ts" are

• The input and output to this tool are vnlog files, complete with a legend
• The format must be passed-in by the user; no default is assumed.
• The given format must not contain whitespace, so that it fits a single vnlog field.
• "-r" is not supported: it assumes input timestamps with whitespace, which is incompatible with vnlog
• A "vnl-ts"-specific option "--vnl-field" is available to set the name of the new field. If omitted, a reasonable default will be used.
• By default we call the "ts" 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 "ts" does is supported, so see that man page for detailed documentation.

COMPATIBILITY¶

By default this calls the tool named "ts". At least on FreeBSD, it's called "moreutils-ts", so on such systems you should invoke "vnl-ts --vnl-tool moreutils-ts ..."

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¶

ts(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.