On Thu, 19 Aug 2004, Mike Branda wrote:
> I've been taking advantage of the shared rsa key that Ian set me up with
> a while back for our 122 render nodes that allows me to ssh without a
> pwd to those specific machines. The next step was to create a couple of
> anyscript.sh shell scripts that basically do a given command on all of
> them. for example ( and I know this is very basic so try not to laugh
> too hard.....) -
>
> #! /bin/sh
>
> echo "attempting to ssh 192.168.3.2 as root"
> ssh root@192.168.3.2 "df -h"
> echo "attempting to ssh 192.168.3.3 as root"
> ssh root@192.168.3.3 "df -h"
> echo "attempting to ssh 192.168.3.4 as root"
> ssh root@192.168.3.4 "df -h"
> echo "attempting to ssh 192.168.3.5 as root"
> ssh root@192.168.3.5 "df -h"
> echo "attempting to ssh 192.168.3.6 as root"
> ssh root@192.168.3.6 "df -h"
> echo "attempting to ssh 192.168.3.7 as root"
> ssh root@192.168.3.7 "df -h"
> echo "attempting to ssh 192.168.3.8 as root"
> ssh root@192.168.3.8 "df -h"
Wouldn't it be easier and more understandable to do
#! /bin/sh
for number in `seq 1 123` ; do
machine=192.168.3.$num
command='df -h'
echo attempting to ssh to $machine as root
ssh root@$machine "$command"
done
? Anyhow, allowing root to ssh in is a bit of a security risk. You don't
know who is doing it; whereas, if you don't allow it and require everyone
to log in and su, you get a log entry something like "session opened for
user root by eben(uid=500)".
> and so on all the way through .123 at the end. If I want to see
> something else I just do a search and replace of whatever is in quotes.
> While this gets the job done, I know that this way is not very efficient
> and it will get worse as more nodes are added. In an effort to learn
> more, can anybody tell me if there's a way to add a variable that
> increases by a factor of 1 until it reaches a certain number (say
> .123)??
It seems I already took care of this. Whoops. So much for listening
before I talk. :-)
> If this could be done, I could just change the stop point for
> the variable. In addition to this does anybody know where any good web
> tutorials are for sh and bash scripting basics??
Hang out in comp.unix.shell. Read what Chris F. A. Johnson writes; he's
good.
-- -eben ebQenW1@EtaRmpTabYayU.rIr.OcoPm home.tampabay.rr.com/hactarrm -f /bin/laden
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