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Full Discussion: Loop and variable not exactly variable: what's wrong
Top Forums UNIX for Dummies Questions & Answers Loop and variable not exactly variable: what's wrong Post 302664663 by bobylapointe on Saturday 30th of June 2012 06:44:07 AM
Old 06-30-2012
Loop and variable not exactly variable: what's wrong
Hello guys,

This truly is a newbie question. I'm trying to make a loop to execute simultaneous commands indefinitely while using variable. Here is how my mess looks like (this is just an example):

Code:
#!/bin/bash
IP=`shuf -n 1 IP.txt`  # I figured this would be easier to select random lines from a file
TIMES=`shuf -n 1 TIMES.txt`

while :
do
ping -c $TIMES $IP &  # "&" to execute commands simulatenously, right?
ping -c $TIMES $IP &
ping -c $TIMES $IP &
	sleep 1
done


expected results: $IP and $TIMES should be different each time, the script should wait for each ping command to be finished (with success or not) to restart this particular ping command.

Could somebody explain to me what's wrong here?


Thank you very much
 

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LEARN ABOUT DEBIAN

mrtg-ping-probe

MRTG-PING-PROBE(1)					      General Commands Manual						MRTG-PING-PROBE(1)

NAME

       mrtg-ping-probe - ping probe module for Multi Router Traffic Grapher

DESCRIPTION

       mrtg-ping-probe is a ping probe module for MRTG 2.x.  It is used to monitor the round trip time and packet loss to networked devices.  MRTG
       uses the output of mrtg-ping-probe to generate graphs visualizing minimum and maximum round trip times or packet loss.

       mrtg-ping-probe is not run directly, but is called by MRTG as a helper when it needs to determine ping time to a host.

       Act responsibly: do not use mrtg-ping-probe to ping devices without the owner's permission.  Just imagine if 10,000 people decided to  ping
       your hosts!  mrtg-ping-probe is meant to be used within your network to get round trip time performance figures for your network.

OPTIONS

       To  use	mrtg-ping-probe you need to configure MRTG to call it from within the definition of a target host. This is done in the MRTG config
       file, which is usually /etc/mrtg.conf.

       Here's an example snippet: change the target name and IP address to suit your needs.

       Target[your.target.ping]: `/usr/bin/mrtg-ping-probe 123.456.789.123`
       SetEnv[your.target.ping]: MRTG_INT_IP="123.456.789.123" MRTG_INT_DESCR="ping"
       MaxBytes[your.target.ping]: 100
       AbsMax[your.target.ping]: 200
       Options[your.target.ping]: gauge, growright
       YLegend[your.target.ping]: ping time (ms)
       ShortLegend[your.target.ping]: ms
       Legend1[your.target.ping]: Maximum Round Trip Time in ms
       Legend2[your.target.ping]: Minimum Round Trip Time in ms
       Legend3[your.target.ping]: Maximal 5 Minute Maximum Round Trip Time in ms
       Legend4[your.target.ping]: Maximal 5 Minute Minimum Round Trip Time in ms
       LegendI[your.target.ping]: &nbsp;Max:
       LegendO[your.target.ping]: &nbsp;Min:

       Pay close attention to the backticks in the first line which tell MRTG to execute the nominated external program. Note also that  you  need
       to use the "gauge" option, since the results of subsequent ping probes are independant values and not an incrementing counter.

SEE ALSO

       mrtg(1).

       The latest release of mrtg-ping-probe can be found on the web at http://pwo.de/projects/mrtg/

AUTHOR

       This manual page was written by Jonathan Oxer <jon@debian.org>, for the Debian project (but may be used by others).

								  April 14, 2003						MRTG-PING-PROBE(1)
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