Ssh multiple hops to execute commands with arguments Post: 302922976

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Top Forums Shell Programming and Scripting Ssh multiple hops to execute commands with arguments Post 302922976 by Corona688 on Wednesday 29th of October 2014 02:13:26 PM

10-29-2014

Registered User

First off -- what exactly is your goal? As far as I can tell, test 1 did exactly what you wanted.

It's not a question of ssh, exactly -- the problem is that you're going through multiple layers of shell. To prevent things from splitting locally, you quote them.

One command deeper, you have to put quotes in quotes -- either single-quotes, or escaped double-quotes -- so the quotes don't "disappear" when they're processed by the local shell.

One command deeper, you have to start escaping them, so they don't disappear here, get processed on the second server, so the third server gets a command its happy with.

Four deep... It starts getting impractical, you end up escaping escaped things, doubling and quadrupling and octupling the number of backslashes to get enough for the last layer to consider it "one" backslash.

I would avoid that completely, and feed text into standard input instead. That way it does not fly through 5 levels of parsing and quote removal.

Code:

ssh server1 ssh server2 ssh server3 ssh server4 ssh server5 exec /bin/sh -s <<EOF
hostname
echo ${LOCALVARIABLE}
echo \${REMOTEVARIABLE}
EOF

Last edited by Corona688; 10-29-2014 at 03:18 PM..

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LEARN ABOUT OPENDARWIN

ssh-argv0

SSH-ARGV0(1)                                                BSD General Commands Manual                                               SSH-ARGV0(1)

NAME

     ssh-argv0 -- replaces the old ssh command-name as hostname handling

SYNOPSIS

     hostname | user@hostname [-l login_name] [command]

     hostname | user@hostname [-afgknqstvxACNTX1246] [-b bind_address] [-c cipher_spec] [-e escape_char] [-i identity_file] [-l login_name]
     [-m mac_spec] [-o option] [-p port] [-F configfile] [-L port:host:hostport] [-R port:host:hostport] [-D port] [command]

DESCRIPTION

     ssh-argv0 replaces the old ssh command-name as hostname handling.  If you link to this script with a hostname then executing the link is
     equivalent to having executed ssh with that hostname as an argument.  All other arguments are passed to ssh and will be processed normally.

OPTIONS

     See ssh(1).

FILES

     See ssh(1).

AUTHORS

     OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen.  Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
     Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH.  Markus Friedl contributed the support for SSH
     protocol versions 1.5 and 2.0.  Jonathan Amery wrote this ssh-argv0 script and the associated documentation.

SEE ALSO

     ssh(1)

Debian Project                                                   September 7, 2001                                                  Debian Project

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