05-08-2013
Adding quotes won't make any difference for this code snippet. There is no way that data_$i.txt will ever expand to data.txt, although it might appear that way if $i contained a backspace character. (But, of course i won't contain a backspace in the loop you listed.)
Please show us the rest of the script or at least add set -xv to the start of your script to figure out what command in your script is actually failing.
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LEARN ABOUT DEBIAN
event2vrule
EVENT2VRULE(1) General Commands Manual EVENT2VRULE(1)
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), similarly to how one might run nohup(1). 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:
VRULE:981841080#ff0000:2001/02/10 1538 added support for events to FlowScan graphs
COMMENT:
VRULE:982015260#ff0000:2001/02/12 1601 allowed the events file to be named on make command line
COMMENT:
SEE ALSO
add_ds.pl(1), add_txrx(1), flowscan(1), ip2hostname(1), locker(1)
AUTHOR
This manual page was written by Anibal Monsalve Salazar, for the Debian Project.
EVENT2VRULE(1)