shell regex matching help

[Giles Orr]

On 12/12/06, Neil Watson <tlug-neil-8agRmHhQ+n2CxnSzwYWP7Q at public.gmane.org> wrote:
> I need help with this script.
>
> #!/bin/bash
>
> HOSTNAME=`hostname`
> SERVICE="db2"
> CLUSTAT=`/usr/sbin/clustat -s ${SERVICE}|tail -n1`
> # Should return:
>   #db2                  your-hostname                 started
>
> echo $HOSTNAME
> echo $SERVICE
> echo $CLUSTAT
>
> if [[ ${CLUSTAT} = ${SERVICE}[:blank:]+${HOSTNAME}[:blank:]+started ]] ; then

I'm not as good at BASH programming as I ought to be, so my preferred
solution is dictated by limited knowledge ....

I don't understand the above "if ..." line.  Wouldn't it be easier to
use ${CLUSTAT##* } and see if that matches "started" rather than
trying to reassemble the correct output?  If you need to check
$SERVICE or $HOSTNAME because you're checking several services or
hosts, perhaps check them separately too with similar name mangling?

>         echo "Node is active"
>         exit 0;
> fi
>
> # Else node is not active.
> echo "Node is not active"
> exit 255
>
> Output:
> :!./activenode
> tor-lx-hadrian
> db2
> db2 tor-lx-hadrian started
> Node is not active
>
> Why is the match failing?


-- 
Giles
http://www.gilesorr.com/
gilesorr-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org
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