Background (nohup * &) SSH command block possible? Post: 302631031

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Top Forums Programming Background (nohup * &) SSH command block possible? Post 302631031 by doonan_79 on Thursday 26th of April 2012 04:06:33 PM

04-26-2012

Registered User

Background (nohup * &) SSH command block possible?

Hello,
I am trying to find a way to send several sequential commands via SSH to a remote box in a single command.
Thoughts so far:

1) Can I put them into a function and call the function within the ssh command?

e.g.

Code:

ssh <targetserver> $(functionx)

No - then it calls the function in the shell on the target and does not recognised it.

2) Can I use a command block?

e.g.

Code:

ssh <targetserver> << EOF
echo 1
echo 2
date
EOF

Hmmm - maybe, but I get these messages:

Code:

"Pseudo-terminal will not be allocated because stdin is not a terminal"
(and on target)
"Warning: no access to tty (Bad file descriptor).
Thus no job control in this shell."

Actually then is does run the commands BUT I'm not sure it's solid.
my final target is that I want to run this whole command in the background --- when I try and do this with nohup I still see these errors
E.g.

Code:

nohup ssh <targetserver> << EOF > <log> &
echo 1
echo 2
date
EOF

Code:

"Pseudo-terminal will not be allocated because stdin is not a terminal"
(and on target)
"Warning: no access to tty (Bad file descriptor).
Thus no job control in this shell."

3) Create a shell script on the target and call that...
this option does work but I really want to find a way to centralise this script so that I don't have to stick the second script on every server I want to connect to.

I think it's quite an interesting one - can anyone advise on the best possible method for generating a set of commands to execute on a remote box via ssh; but with one SSH command?

NB It cannot be several SSH commands as I need this to both be run in the background and also for the commands to be sequential.

Thanks in advance!
Jamie Neilan

Last edited by Corona688; 04-26-2012 at 05:12 PM..

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LEARN ABOUT MINIX

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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