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Full Discussion: Nohup not working as expected
Top Forums UNIX for Dummies Questions & Answers Nohup not working as expected Post 302839035 by sebcou on Wednesday 31st of July 2013 07:35:25 AM
Old 07-31-2013
Nohup not working as expected
Hi. I am trying to start a script on my router that will execute even if i log off. To execute the script I write:

nohup ./dslconnection > dslstat.out 2>&1 &

It starts the job:
21968 admin 1604 S /bin/ash ./dslconnection

The problem is that when I log back in the job has been terminated.

To debug I tried the same thing with ping.
nohup ping 192.168.1.91 > dslstat.out 2>&1 &

This worked and ping was still executed when I logged back in.

The script I want to run is below. Any ideas of what could be the problem??

Code:
#!/bin/ash
statusname=0
while true
 do
        laststatus=$statusname
        ping -c 1 -W 1 www.google.se > /dev/null
        statusname=$?
        if [ "$statusname" -ne "$laststatus" ]; then
           date
           if [ "$statusname" -eq 0 ]; then
                  echo Google is reachable
           else
                  echo Google unreachable
           fi
        fi
    sleep 10
done

 

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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]:  Max:
       LegendO[your.target.ping]:  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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