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Full Discussion: BASH - Need to echo for loop output to one line
Top Forums Shell Programming and Scripting BASH - Need to echo for loop output to one line Post 302932418 by Corona688 on Wednesday 21st of January 2015 12:04:20 PM
Old 01-21-2015
Why not run grep on the server instead of cat? Less traffic.

Also, a while loop is more appropriate.

Use printf to print a string without adding a newline at the end.

ssh -n is used to prevent ssh from 'eating' all the input in versions.txt (otherwise it would run once then stop).

If ssh fails, it prints "couldn't login", so you don't get a line like server1 server2 server3 server4 server4-information when server1-3 fail to login.

Code:
while read i
do
        printf "%s " "$i"
        ssh -n $i grep release /etc/issue || echo "couldn't login"
done < versions.txt

This User Gave Thanks to Corona688 For This Post:
lombardi4851
 

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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
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