Check if file exists via ssh in ssh (nested) Post: 302922230

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Top Forums Shell Programming and Scripting Check if file exists via ssh in ssh (nested) Post 302922230 by say170 on Thursday 23rd of October 2014 11:19:12 AM

10-23-2014

Registered User

Check if file exists via ssh in ssh (nested)

I'm using redhat and have an odd issue with a nested ssh call.

Code:

ssh -i ~/.ssh/transfer-key -q transfer@fserver1 [[ -f /home/S/outbox/complete ]] 
&& ssh -i ~/.ssh/transfer-key transfer@fserver1 "ssh -i ~/.ssh/sftp-key sftpin@10.0.0.1 [[ ! -f /datain/complete]]" 
&& ssh -i ~/.ssh/transfer-key transfer@fserver1 "scp -i ~/.ssh/sftp-key /home/S/outbox/* sftpin@10.0.0.1:/datain" 
&& ssh -i ~/.ssh/transfer-key transfer@server1 "rm /home/S/outbox/*"

what this is doing is checking if a complete file is in an outbox, if so, ssh to a transfer server, executing a second ssh and checking if a file is 'not' present on the destination and if no, sending the files. I'm restricted to which ids and servers can be used, hence this convoluted method.

I'm getting a syntax error on the part where I'm checking if the file doesn't exist on the target.

Code:

ksh: syntax error at line 1: `[[' unmatched

Any ideas how to check this in an embedded ssh call?

Thanks in advance

---------- Post updated at 10:19 AM ---------- Previous update was at 10:13 AM ----------

doh... missed a space at the end before ]]
only when I posted it here was it obvious.

Last edited by say170; 10-23-2014 at 12:15 PM.. Reason: added some CR to code to improve readability

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LEARN ABOUT SUSE

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

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

SYNOPSIS

     ssh-keysign

DESCRIPTION

     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.

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

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about host-based authen-
     tication.

FILES

     /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, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if host-
	     based authentication is used.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								   May 31, 2007 							       BSD