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Full Discussion: Remote ssh and return values..
Top Forums Shell Programming and Scripting Remote ssh and return values.. Post 302419862 by id100 on Sunday 9th of May 2010 11:58:45 PM
Old 05-10-2010
Remote ssh and return values..
hi

I'm executing below 2 cmds which is working file.. ( cmd will ssh to remote host and look for pattern in remote file)

Code:
ssh $USER@$HOST "grep -n \"$PATTERN\" $RDIR/$RFILE | awk -F":" '{print \$1}'|tr '\n' ':'|sed 's/:$//g'" > /tmp/_log_out
VAR=`cat /tmp/_log_out`

output in /tmp/_log_out comes as expected if any file having that pattern

I want to achieve in one line which wants to include in the ssh cmd itself if the no pattern found then a variable should be set to 0.

like ex. ( directly storing the result in a variable and result is nothing variable should be 0)

Code:
ssh user@host "VAR=`grep -n \"$PATTERN\" $RDIR/$RFILE | awk -F":" '{print \$1}'|tr '\n' ':'|sed 's/:$//g'"`; if [ -z "$VAR" ];then VAR="0";fi"

reason for asking this....after getting the line number executing below line also to get others details (no. of chars in file's 1st line & file inode) which is also working...

my intention is achieve this 2ssh cmds in one line.

Code:
ssh $USER@$HOST "cat $RDIR/$RFILE | grep -v '^$' | head -1 |wc -c;ls -li $RDIR/$RFILE|awk '{print \$1}'" |xargs -n 2 | awk '
{ print $1":"$2":" }' > /tmp/_log-chk-output_$$

[just fyi] ===> objective: This script ssh to many servers and looks for pattern in few log files and store in a local flat file in below format
line # of pattern found:total no. of chars in file's 1st line:file inode number

Script is working one, only concern im ssh to servers twice (first time to get the line of pattern & 2nd to get the rest of dtls). Now looking to optimize in 1ssh cmd to achieve both. appreciate your help
Last edited by Scott; 05-10-2010 at 03:06 AM.. Reason: Please use code tags
 

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LEARN ABOUT DEBIAN

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_ecdsa_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.

     /etc/ssh/ssh_host_dsa_key-cert.pub
     /etc/ssh/ssh_host_ecdsa_key-cert.pub
     /etc/ssh/ssh_host_rsa_key-cert.pub
	     If these files exist they are assumed to contain public certificate information corresponding with the private keys above.

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
								  August 31, 2010							       BSD
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