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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
Old 04-26-2012
Error 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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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 and append the indicated identity file to that machine's ~/.ssh/autho- rized_keys file. 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.) NOTES
This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability disabled manu- ally, e.g. via chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys on the remote machine. SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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