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ssh breaks loop

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# 1  
Old 07-13-2011
ssh breaks loop
Here is the smallest extract to demonstrate the problem that I experience.
Code:
#!/bin/bash

r=$1

while read ip
do
	if [[ $r = "" ]] ;then	
		x=`ssh $ip echo "$ip"`
	else
		x=`echo "$ip"`
	fi
	echo $x
done << EOF
192.168.8.241
192.168.8.241
EOF
# Any IP with public key set

This loop is executed once, If called with echo executed remotely, without ssh everything is OK. Somehow ssh breaks standard input. Doesn't matter whether it is here-doc or a regular file. There are plenty of workarounds but why this snippet behaves as it does?

Thanks

---------- Post updated 07-13-11 at 12:37 PM ---------- Previous update was 07-12-11 at 10:20 PM ----------

Figured it out: ssh -n does the trick
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LEARN ABOUT SUSE

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

     ssh-keysign -- ssh helper program for host-based authentication

SYNOPSIS

     ssh-keysign

DESCRIPTION

     ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with
     SSH protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the global client configuration file /etc/ssh/ssh_config by setting
     EnableSSHKeysign to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about host-based authen-
     tication.

FILES

     /etc/ssh/ssh_config
	     Controls whether ssh-keysign is enabled.

     /etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key
	     These files contain the private parts of the host keys used to generate the digital signature.  They should be owned by root, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if host-
	     based authentication is used.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								   May 31, 2007 							       BSD