Re: [OT] secure script without cron?

[David Wright <d.wright@open.ac.uk>]

Quoting ktb (ktb@nixnotes.org):

> #!/bin/sh
> # cheknet
>  
> while [ true ]; do
>     ping -qc 2 10.10.10.9 &> /dev/null
>  
>     if [ "$?" -eq 0 ]; then
>         echo "*** $(date)" >> cheknet.log
>     else
>         echo "Network Down ***" >> cheknet.log
>         /etc/init.d/networking restart >> cheknet.log
>         echo "--- Network Restarted ---" >> cheknet.log
>     exit
>     fi
> sleep 5s
> done

Two possible solutions to this:

1) Leave it running all the time. Instead of exiting at line 13,
break out of that loop into an outer one which sleeps for as long as
you are prepared to let your network be down.

2) Touch a file when you start your loop, remove it when the network
checks OK before you exit. Check for the presence of the file right
at the start and exit if it exists.

BTW isn't your exit in the wrong branch? If you restart the network,
you need to loop back to ping again to see if it's now up. If ping
succeeds (0), you exit.

Cheers,

-- 
Email:  d.wright@open.ac.uk   Tel: +44 1908 653 739  Fax: +44 1908 655 151
Snail:  David Wright, Earth Science Dept., Milton Keynes, England, MK7 6AA
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