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Full Discussion: Error Executing a script(SSH problem)
Top Forums UNIX for Dummies Questions & Answers Error Executing a script(SSH problem) Post 302437133 by royalibrahim on Wednesday 14th of July 2010 05:35:02 AM
Old 07-14-2010
The problem is that the loop and ssh (by default) read from the same stdin, and ssh "consumes" (eats) the input to feed it to the remote command, that would otherwise have been read by the loop. Otherwise, you wouldn't be able to run a shell on the remote system. Even when running a specific command, that command might still read from stdin, and since ssh reads from stdin you can supply data to it using the local stdin. Use ssh -n option to redirect stdin from /dev/null (prevents reading from stdin) and use ssh -T that runs the command without attempting to allocate a tty. ssh waits until all connections to stdin (from the ssh perspective) are closed. With an interactive shell the stdout of all child processes is connected to the shell, which maintains a single connection to the terminal. So when the shell terminates that means all connections to the stdin of the ssh session are closed. Without a shell all children are directly connected so the ssh session is forced to stay around.
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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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