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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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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities) It also changes the permissions of the remote user's home, ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would oth- erwise prevent you from logging in, if the remote sshd has StrictModes set in its configuration). If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary) SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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