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Full Discussion: Check if file exists via ssh in ssh (nested)
Top Forums Shell Programming and Scripting Check if file exists via ssh in ssh (nested) Post 302922304 by Chubler_XL on Thursday 23rd of October 2014 04:09:27 PM
Old 10-23-2014
If you tunnel to this machine a lot, did you know you can setup ssh to do it for you.

So lets say this machine 10.0.0.1 is called saysdata.

If you put something like the below in your ~/.ssh/config file:

Code:
host fserver1
user transfer
IdentityFile ~/.ssh/transfer-key

host saysdata
user sftpin
IdentityFile ~/.ssh/sftp-key
ProxyCommand ssh fserver1 -W %h:%p

I haven't tried this with alternate identityfiles and this will require you to bring the sftp-key to your local machine. Perhaps someone with more experience in this area knows of a way to keep the identity file on the jump box.

Anyway the result should be that you will be able to simply type:

Code:
ssh saydata "[[ -f /datain/complete ]]"
scp fserver:/home/S/outbox saydata:/datain
ssh fserver1 "rm /home/S/outbox/*"

Without worrying about identity files or nested ssh and scp commands. Much easier and probably worth a little mucking around to get working if you do it semi-regular.
 

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LEARN ABOUT DEBIAN

gnome-ssh-askpass

GNOME-SSH-ASKPASS(1)					      General Commands Manual					      GNOME-SSH-ASKPASS(1)

NAME

       gnome-ssh-askpass - prompts a user for a passphrase using GNOME

SYNOPSIS

       gnome-ssh-askpass

DESCRIPTION

       gnome-ssh-askpass  is  a GNOME-based passphrase dialog for use with OpenSSH.  It is intended to be called by the ssh-add(1) program and not
       invoked directly.  It allows ssh-add(1) to obtain a passphrase from a user, even if not connected to a terminal (assuming that an X display
       is  available).	This happens automatically in the case where ssh-add is invoked from one's ~/.xsession or as one of the GNOME startup pro-
       grams, for example.

       In order to be called automatically by ssh-add, gnome-ssh-askpass should be installed as /usr/bin/ssh-askpass.

ENVIRONMENT VARIABLES

       The following environment variables are recognized:

       GNOME_SSH_ASKPASS_GRAB_SERVER
	      Causes gnome-ssh-askpass to grab the X server before asking for a passphrase.

       GNOME_SSH_ASKPASS_GRAB_POINTER
	      Causes gnome-ssh-askpass to grab the mouse pointer using gdk_pointer_grab() before asking for a passphrase.

       Regardless of whether either of these environment variables is set, gnome-ssh-askpass will grab the keyboard using gdk_keyboard_grab().

AUTHOR

       This manual page was written by Colin Watson <cjwatson@debian.org> for the Debian system (but may be used by others).  It was based on that
       for x11-ssh-askpass by Philip Hands.

															      GNOME-SSH-ASKPASS(1)
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