scp to invoke files stored in environment variable

shik28 · 09-15-2011, 05:35 AM

Hi,

I need to a file temp.txt from a remote computer to my local system.The remote system has files stored in an environmental variable $LOGDATA. But when I use this in scp $LOGDATA/temp.txt, it says LOGDATA: No such file or directory. What has to be written in order to retrieve the file?

jmulligan · 09-15-2011, 09:50 AM

Are you issuing the scp command on the remote system or the local system? It seems that $LOGDATA is not defined in the context in which you are trying to execute the command...

schneidz · 09-15-2011, 09:58 AM

echo $LOGDATA mite help us determine where the issue is ?

edit: make sure you define LOGDATA in the pc you are running scp from.

shik28 · 09-15-2011, 10:38 AM

I have written scp in a java program where I am creating a form to take the username, password and the required file to be retrieved from the remote system as input.

I have not defined $LOGDATA anywhere in the java program. If it is required, where do I define it?

Moreover I give $LOGDATA as input during runtime. If that is the case I won't be able to define it.

Should I attach the code?

schneidz · 09-15-2011, 10:44 AM

i dont know. from your first post LOGDATA seemed like a variable specific to your site. no one else can tell you what it should be. maybe the admin of the server can tell you.

if you are unable to scp successfully from the command line then your java-gui wrapper will never work.

shik28 · 09-15-2011, 11:27 AM

Yes. scp is not successful from command line also.

Any alternate solution?

schneidz · 09-15-2011, 02:39 PM

i would check the basics:
are you sure the ssh service is running on the remote machine ?
are you sure that the local file exists ?
are you sure that the remote directory exists ?
...

can you please copy-and-paste the command you are trying to run and the error you are getting (you do realize we cant see your screen <@

).

Reuti · 09-15-2011, 02:52 PM

When I get it right, $LOGDATA is defined for you when you ssh to the remote machine. I.e. it’s a variable only known on the remote side, but not when you include it in the local scp command. So it must be executed on the remote side instead:

Code:

$ ssh -C server cat \$LOGDATA/temp.txt | cat > temp.txt

I added -C to compress the file during the transfer.

shik28 · 09-15-2011, 08:52 PM

Quote:

Originally Posted by schneidz

i would check the basics:
are you sure the ssh service is running on the remote machine ?
are you sure that the local file exists ?
are you sure that the remote directory exists ?
...

can you please copy-and-paste the command you are trying to run and the error you are getting (you do realize we cant see your screen <@

).

1. Yes, I am sure that ssh service is running on the remote machine because the code works fine if I try to retrieve files from the root directory.

2. This code creates the local file if it doesn't exist. So that is not an issue.

3. Remote directory doesn't exist but all the files are stored in $LOGDATA

4. Here's the link to the code which I am trying to run: http://www.jcraft.com/jsch/examples/ScpFrom.java

chrism01 · 09-16-2011, 01:12 AM

$LOGDATA is shell var and only exists in the context of the process that created it AND is still running.
It cannot be a remote var, as you cannot read the vars created by another process...

shik28 · 09-16-2011, 03:41 AM

What can be done in order to retrieve those files now?