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Full Discussion: Executing a background script using ssh keys
Top Forums Shell Programming and Scripting Executing a background script using ssh keys Post 302867123 by nbriozzo on Wednesday 23rd of October 2013 01:11:43 PM
Old 10-23-2013
Executing a background script using ssh keys
Greetings, i've been working with a user-friendly menu on ksh to allow users execute scripts located on a remote server, so they wont have to login and manually launch those scripts every single time.

This is a HP-UX box and currently on a /usr/bin/ksh shell.

I've setup ssh keys on both servers, so i'm able to execute commands remotely using ssh (ej, ssh vic@targetserver ls -l). My script basically gathers several variables from user input, then assambles the whole command and tries to execute it with ssh to the other server.

What i'm currently unable to do, is to finally get that command executed AND give the prompt back to the user so he can continue using the menu (even when using & and nohup).

Code:
 scriptname="/home/myuser/script" -> After user input, this variable is set with the remote script name.
                                                  
finalcommand="ssh user@server nohup $scriptname >/dev/null 2>&1 &"

$finalcommand

OR

Code:
 finalcommand="ssh user@server nohup $scriptname >/dev/null 2>&1 &"

$finalcommand $

I've managed to get two results: Either the command does not gets executed, or it does but will not give prompt back.

If i try to manually run the full command, it will work nicelly:

Code:
 ssh user@server nohup /home/myuser/script >/dev/null 2>&1 &

I'm quite sure this is a syntax/variable issue, but i've been breaking my head for two days and i'm out of ideas. My apologies in advance if more information is needed to understand the issue, i'm not used to post messages here.

Regards
Last edited by nbriozzo; 10-23-2013 at 02:19 PM..
 

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LEARN ABOUT DEBIAN

xsession.options

Xsession.options(5)						File Formats Manual					       Xsession.options(5)

NAME

       Xsession.options - configuration options for Xsession(5)

DESCRIPTION

       /etc/X11/Xsession.options  contains a set of flags that determine some of the behavior of the Xsession(5) Bourne shell (sh(1)) script.  See
       the Xsession(5) manpage for further information.

       Xsession.options may contain comments, which begin with a hash mark ('#') and end at the next newline, just like comments in shell scripts.
       The  rest  of  the  file consists of options which are expressed as words separated by hyphens, with only one option per line.  Options are
       enabled by simply placing them in the file; they are disabled by prefixing the option name with 'no-'.

       Available options are:

       allow-failsafe
	      If the 'failsafe' argument is passed to the Xsession script, an emergency X session is  invoked,	consisting  of	only  an  x-termi-
	      nal-emulator(1)  in  the	upper-left hand corner of the screen.  No window manager is started.  If an x-terminal-emulator program is
	      not available, the session exits immediately.

       allow-user-resources
	      If users have a file called .Xresources in their home directories, these resources will be merged with the default X resources  when
	      they log in.

       allow-user-xsession
	      If users have an executable file called .xsession in their home directories, it can be used as the startup program for the X session
	      (see Xsession(5)).  If the file is present but not executable, it may still be used, but is assumed to be a Bourne shell script, and
	      executed with sh(1).

       use-session-dbus
	      If the dbus package is installed, the session bus will be activated at X session launch.

       use-ssh-agent
	      If  the  ssh-agent(1)  program  is  available  and  no agent process appears to be running already, the X session will be invoked by
	      exec'ing ssh-agent with the startup command, instead of the startup command directly.

       All of the above options are enabled by default.  Additional options may be supported by the local  administrator.   Xsession(5)  describes
       how this is accomplished.

AUTHORS

       Stephen Early, Mark Eichin, and Branden Robinson developed Debian's X session handling scripts.	Branden Robinson wrote this manual page.

SEE ALSO

       Xsession(5), ssh-agent(1), x-terminal-emulator(1)

Debian Project							    2004-10-31						       Xsession.options(5)
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