shell scripting

[Oliver Grawert]

hi,
Am Samstag, den 09.11.2013, 17:23 +0100 schrieb pluto mars:
> Hi,
> 
> 
> I need some help with shell scripting (/bin/sh) in ubuntu.
> 
> 
> In a shell script I want to turn down an interface, say eth0 and then
> turn it up. 
> 
> So something like
> 
> 
> ifdown eth0
> 
> ifup eth0
> 
> 
> But what I want in my shell script is to check and wait till eth0 is
> up and then start doing something next in my shell script.
> 
> So something like "if ( eth0 not is up ) { sleep 1 }. But how do I do
> this in shell scripting ?
> 
try using an upstart job instead ;) this will be 10x easier, smaller and
perfectly reliable (vs polling the device or pinging a router or
whatever)
http://upstart.ubuntu.com/cookbook/

alternatively an if-up.d script could work as well (though there you
still would have to poll for syslog running which upstart gives you for
free via events)

/etc/network/if-up.d/openssh-server is a good example of an if-up.d
script that triggers on specific interfaces (if you have ssh installed)

ciao
	oli
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