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Full Discussion: Using a find command in ssh but using local variables?
Top Forums Shell Programming and Scripting Using a find command in ssh but using local variables? Post 302824767 by Orionizer on Friday 21st of June 2013 01:27:30 PM
Old 06-21-2013
Using a find command in ssh but using local variables?
I have a script like this (Yes, I know the DAY6 number isn't right - I'm just testing at this point):

Code:
DAY0=`date -I`
DAY1=`date -I -d "1 day ago"`
DAY6=`date -I -d "2 days ago"`

if [ ssh root@synology1 -d /volume1/Fileserver/$DAY6 ]
then
ssh root@synology1 nohup rm -rf "/volume1/Fileserver/$DAY6"
fi

I've tested the line to remove the files at the command line and it works great, but I'd like to skip it doing this if the folder doesn't exist.

Now, I've read that I need to modify the if line to something like:

Code:
ssh root@synology1 'if [ -d /volume1/Fileserver/$DAY6 ] then nohup rm -rf "/volume1/Fileserver/$DAY6" fi'

My question is, I don't think this will work as $DAY6 is a local variable to the local script and won't be available on the system I'm SSH'ing into.

Anyone know how I could do this?

Thanks in advance!
 

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LEARN ABOUT OPENDARWIN

ssh-keysign

ssh-keysign(1M)                                                                                                                    ssh-keysign(1M)

NAME

       ssh-keysign - ssh helper program for host-based authentication

SYNOPSIS

       ssh-keysign

       ssh-keysign  is  used  by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication
       with SSH protocol version 2. This signature is of data that includes, among other items, the name of the client host and the  name  of  the
       client user.

       ssh-keysign  is  disabled  by  default and can be enabled only in the global client configuration file /etc/ssh/ssh_config by setting Host-
       basedAuthentication to yes.

       ssh-keysign is not intended to be invoked by the user, but from ssh. See ssh(1) and sshd(1M) for more information about host-based  authen-
       tication.

       /etc/ssh/ssh_config

           Controls whether ssh-keysign is enabled.

       /etc/ssh/ssh_host_dsa_key
       /etc/ssh/ssh_host_rsa_key

           These  files  contain the private parts of the host keys used to generate the digital signature. They should be owned by root, readable
           only by root, and not accessible to others. Because they are readable only by root, ssh-keysign must  be  set-uid  root  if  host-based
           authentication is used.

       ssh-keysign will not sign host-based authentication data under the following conditions:

         o  If the HostbasedAuthentication client configuration parameter is not set to yes in /etc/ssh/ssh_config. This setting cannot be overri-
            den in users' ~/.ssh/ssh_config files.

         o  If the client hostname and username in /etc/ssh/ssh_config do not match the canonical hostname of  the  client  where  ssh-keysign  is
            invoked and the name of the user invoking ssh-keysign.

       In  spite of ssh-keysign's restrictions on the contents of the host-based authentication data, there remains the ability of users to use it
       as an avenue for obtaining the client's private host keys. For this reason host-based authentication is turned off by default.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWsshu                     |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

       ssh(1), sshd(1M), ssh_config(4), attributes(5)

AUTHORS

       Markus Friedl, markus@openbsd.org

HISTORY

       ssh-keysign first appeared in Ox 3.2.

                                                                    9 Jun 2004                                                     ssh-keysign(1M)
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