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Top Forums Shell Programming and Scripting Help with script, shutdown if no ping responce Post 302156186 by porter on Monday 7th of January 2008 03:19:34 PM
Old 01-07-2008
Code:
#!/bin/sh

DOSHUTDOWN=/usr/bin/true

for d in a b c
do
    if /usr/sbin/ping cable-ip
    then
         DOSHUTDOWN=/usr/bin/false
         break
    fi
done

if $DOSHUTDOWN
then
   shutdown -g 1 -y -i 5
fi

I suggest you just save this script, make it executable then test it as root *before* installing it as a cronjob.

Also, I suggest you add some kind of test at the start to only enable the shutdown after a completely successful bootup, otherwise you may get in the situation where as soon as you start the box up, it starts cron, and finds it has no path to the modem and shuts down before getting the network started.
 

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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe name ... DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /usr/bin/gdb'' it will create the following two files: -rwxr-xr-x 1 root root 1026675 Jun 7 13:53 /usr/bin/gdb -rwxr-xr-x 1 root root 2304524 May 30 13:02 /usr/bin/gdb~ /usr/bin/gdb~ is the original file and /usr/bin/gdb is the self-uncompressing executable file. You can remove /usr/bin/gdb~ once you are sure that /usr/bin/gdb works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some standard utilities (basename, chmod, ln, mkdir, mktemp, rm, sleep, and tail). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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