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Full Discussion: Non-interactive FTP within SSH session not working
Top Forums Shell Programming and Scripting Non-interactive FTP within SSH session not working Post 302538964 by Subu1987 on Thursday 14th of July 2011 04:20:54 PM
Old 07-14-2011
Error Non-interactive FTP within SSH session not working
Hello everyone!

I am trying to log-in to a remote server over SSH, transfer file1 there, perform some checks, capture the results in file2 and transfer file2 back to my local server - all of this non-interactively. Initially, I tried to do this within a singe SSH session, using the following code --

Code:
#! /usr/bin/ksh

ssh remotehost "
       [[ ! -d /tmp/workDir ]] && mkdir -p /tmp/workDir
       cd /tmp/workDir
       ftp -nv myLocalHost << EOFTP > /dev/null 2>&1
       user myID myPass
       prompt
       mget file1
       bye
       EOFTP

       while read row
       do
              if [[ -d $row ]]
              then
                    echo "$row is present!"
              else
                    echo "$row is missing!" >> file2
              fi
       done < file1

       if [[ -s file2 ]]
       then
              ftp -nv myLocalHost << EOFTP > /dev/null 2>&1
              user myID myPass
              prompt
              mput file2
              bye
              EOFTP
       fi"

While running this piece, I find that the process is stuck after the "bye" in the first FTP sequence. The script is not executing anything after that. So, to troubleshoot, I tried putting the first FTP in one SSH session, and everything after that in another. This time the FTP prompt is getting terminated properly, and the second SSH connection is also successful, but the error being thrown is -
Quote:
ksh[2]: syntax error in line 3: ']]' unexpected
I guess putting all the separate sections of my code (i.e., the first FTP, the checking and the 2nd FTP) in separate SSH sessions would resolve this issue, however, it might not be preferable, as this is part of a much-larger program, which I'm trying to keep as light as possible.

I'm doing this on Solaris platform, using KSH. I've also checked and confirmed that my default shell in the remote host is KSH (though, I'm not sure if that would make any difference).

Please advice. Thanks a lot, in advance!

With regards,
Subu
 

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LEARN ABOUT DEBIAN

knife-ssh

KNIFE-SSH(1)							    Chef Manual 						      KNIFE-SSH(1)

NAME

       knife-ssh - Run a command or interactive session on multiple remote hosts

SYNOPSIS

       knife ssh QUERY COMMAND (options)

       -a, --attribute ATTR
	      The attribute to use for opening the connection - default is fqdn

       -C, --concurrency NUM
	      The number of concurrent connections

       -m, --manual-list
	      QUERY is a space separated list of servers

       -P, --ssh-password PASSWORD
	      The ssh password

       -x, --ssh-user USERNAME
	      The ssh username

       -i, --identity-file IDENTITY_FILE
	      The SSH identity file used for authentication

       -p, --ssh-port PORT
	      The ssh port

       --[no-]host-key-verify
	      Verify host key, enabled by default.

DESCRIPTION

       The  ssh  sub-command  opens  an  ssh  session  to each of the nodes in the search results of the QUERY. This sub-command requires that the
       net-ssh-multi and highline Ruby libraries are installed. On Debian systems, these are the libnet-ssh-multi-ruby and libhighline-ruby  pack-
       ages. They can also be installed as RubyGems (net-ssh-multi and highline, respectively).

TERMINAL MULTIPLEXING AND TERMINAL TAB SUPPORT

       knife  ssh integrates with several terminal multiplexer programs to provide a more convenient means of managing multiple ssh sessions. When
       the COMMAND option matches one of these, knife ssh will create multiple interactive ssh sessions running locally  in  the  terminal  multi-
       plexer instead of invoking the command on the remote host.

       The available multiplexers are:

       interactive
	      A built-in multiplexer. interactive supports running commands on a subset of the connected hosts in parallel

       screen(1)
	      Runs ssh interactively inside screen. ~/.screenrc will be sourced if it exists.

       tmux(1)
	      Runs ssh interactively inside tmux.

       macterm (Mac OS X only)
	      Opens  a	Terminal.app  window and creates a tab for each ssh session. You must install the rb-appscript gem before you can use this
	      option.

SEE ALSO

       knife-search(1)

AUTHOR

       Chef was written by Adam Jacob adam@opscode.com with many contributions from the community.

DOCUMENTATION

       This manual page was written by Joshua Timberman joshua@opscode.com. Permission is granted to copy, distribute and / or modify  this  docu-
       ment under the terms of the Apache 2.0 License.

CHEF

       Knife is distributed with Chef. http://wiki.opscode.com/display/chef/Home

Chef 10.12.0							     June 2012							      KNIFE-SSH(1)
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