On Wed, Feb 1, 2012 at 2:53 PM, Stephen Harris <lists@xxxxxxxxxx> wrote:
> On Wed, Feb 01, 2012 at 01:07:31PM -0800, Peter Blajev wrote:
> > echo " server2
> > server2" | \
> > while read confLine; do
> > echo "--> $confLine"
> > ssh peter@$confLine ls
> > echo "--> END $confLine"
> > done
>
> > The "for" loop in the script above will run twice but the "while" loop
> > below it will run only once.
>
> > Any idea what would cause the ssh command to break the while loop?
>
> "ssh" is reading from stdin and passing the data over to the remote
> machine. You can test this with
> ssh peter@$confLine 'read x ; echo we got $x'
>
> To stop it doing this, use the "-n" flag
> ssh -n peter@$confLine ls
This is it. Right on Stephen. Thank you very much. I can't believe I've
gone so long without knowing it.
This works for me. I still don't have full understanding of it but I'll do
some more reading.
Unfortunately I can't always use the (-n) option. If I wan't to send data
through the pipe then the (-n) won't work. For example (on top of my head):
mysqldump dB | ssh peter@remoteServer "mysql dB"
In my script I ended up using "ssh -n" when I want to work on the output of
remotely ran command and "ssh" without (-n) when I want to send data over
ssh to a remote command.
This so far is not breaking the while loop and it seems to be working but
it makes me nervous.
Any note will be appreciated.
Thanks again.
--
Peter
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