How to run script (sleep360) without delaying bootup

[Steve Siegfried]

Nigel Henry wrote:
> 
> On Sunday 22 April 2007 18:19, Scott Berry wrote:
> > Nigel, what would you want to ping?  I think you could put a line in that
> > script to do that.
> >
> > Scott
> 
> Pinging a server on the Internet isn't really the problem, as long as nobody 
> get's T'd off on getting a ping on a daily basis. All I want is a script that 
> will continually send a ping to <some server>, then when the Internet 
> connection is up, and it gets a positive response from the server, will then 
> run /usr/local/bin/ntp-restart, and terminate the ping. This will then 
> restart the ntp daemon, and all of the servers listed in /etc/ntp.conf will 
> be polled.
> 
> At the moment when the ntp daemon is started at bootup on FC2, I get varying 
> results. Post bootup I connect to the Internet, and sometimes just one of the 
> six timeservers is listed when running ntpq> pe, and sometimes 4 of the 
> timeservers are listed, but never the 6. If I do an /etc/init.d/ntpd stop, 
> followed by an /etc/init.d start, then run ntpq, I see all 6 Internet 
> timeservers listed.
> 
> There is a problem with the ntp daemon, at least on FC2, when no Internet 
> connection is available at bootup.
> 
> Nigel.
> 

You can probably do this without pinging.

Assuming you talk to the outside internet via eth0, then "ifconfig eth0"
won't tell you what your ip-address is until eth0 is all the way up.

Thus, the following script will either:
	- print your ip-address and return 0 (success),
or
	- print "eth0 not active." and return 1 (failure).

    > #!/bin/ksh
    > DEVICE=${1:-eth0}
    > if [ `/sbin/ifconfig | grep ^$DEVICE | wc -l` = 0 ]
    > then echo "$DEVICE not active."
    >      exit 1
    > else mungeline=`/sbin/ifconfig $DEVICE | grep "inet addr" | tr -s ":" " " | cut -d' ' -f4`
    >      echo $mungeline
    >      exit 0
    > fi

Hope this helps,

-S