---
name: "event2vrule"
section: "1"
platform: "linux"
package: "flowscan"
version: "1.006-13.2"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/event2vrule"
---

# event2vrule(1)

adds 'events' to rrdtool graphs

## NAME

event2vrule - adds 'events' to rrdtool graphs

## SYNOPSIS

**event2vrule \<params\>**

## DESCRIPTION

Adding Events to Graphs

There is a new graphing feature which allows you to specify events that should be displayed in your graphs. These events are simply a list of points in time at which something of interest occurred.

For instance, one could create a plain text file in the graphs directory called events.txt containing these lines:

  2001/02/10 1538 added support for events to FlowScan graphs\
   2001/02/12 1601 allowed the events file to be named on make command line

Then to generate the graphs with those events included one might run:

  $ make -f graphs.mf events=events.txt

This feature was implemented using a new script called event2vrule that is supplied with FlowScan. This script is meant to be used as a \`\`wrapper'' for running [rrdtool(1)](/rrdtool/1.md), similarly to how one might run [nohup(1)](/nohup/1.md). E.g.:

  $ event2vrule -h 48 events.txt rrdtool graph -s -48h ...

That command will cause these VRULE arguments to be passed to rrdtool, at the end of the argument list:

  COMMENT:\\n\
   VRULE:981841080#ff0000:2001/02/10 1538 added support for events to FlowScan graphs\
   COMMENT:\\n\
   VRULE:982015260#ff0000:2001/02/12 1601 allowed the events file to be named on make command line\
   COMMENT:\\n

## SEE ALSO

[**add\_ds.pl**(1)](/add_ds.pl/1.md), [**add\_txrx**(1)](/add_txrx/1.md), [**flowscan**(1)](/flowscan/1.md), [**ip2hostname**(1)](/ip2hostname/1.md), [**locker**(1)](/locker/1.md)

## AUTHOR

This manual page was written by Anibal Monsalve Salazar, for the Debian Project.