Shell Programming and Scripting

Hi,

I want to a transfer file from remote machine to a local machine using SFTP where both my local and remote machines are Ubuntu machines.So i wanted to write a unix bash script which uses SFTP command to transfer the file from remote to local machine.

My remote server is 178.28.30.106.
I'm trying to transfer the file file1 located in the remote machine location "/home/user/datafiles/" to the local machine directory "/home/user/receivedFiles/".

So how to write unix bash script to achieve the file transfer using SFTP?

Thanks,
Shree

So a few questions:-Most importantly, What have you tried so far?

I don't want to seem aggressive or petty, but I could give you an answer that meets your stated need, but it may either not be quite what you intended and you won't learn how to maintain or support it.

Have a go and let us know where you get stuck and what output/errors you have so we can help.



Robin

Hi rbatte1,

I have set up the SSH keys for passwordless authentication. Also i tried transferring the file from remote machine to a local machine without writing a unix bash script wich is working fine. I'm able to transfer the file from remote machine to th local machine.
Here initially i moved to the directory where my datafile is residing using and later on did the below code to get the remote file on to local directory

Code:

sftp> get file1.txt newFile.txt

Using unix script , i saw many similar cases where they have used
but i wanted to use .
So how to use this and what's the difference between these two?

My bash script is

Code:

#!/bin/bash
HOST='178.20.30.106'
USER='root'
PASSWD='abc'
sftp $USER@$HOST <<EOF
lcd /home/user/receivedFiles/
cd  /home/user/datafiles/
get file1.txt mynewfile.txt
EOF

When i run the above code i'm able to transfer the file from remote to loacl but the problem is nowhere i'm using the password(PASSWD) . So when i run the above script it asks me for the password to enter throught the commandline prompt. So how to avoid this ?
How can i pass PASSWD value so that the human intervension will not be there in transferring the file.

Thanks,
Shree

The expect tool is not standard unix. It's freely available, but it#'s a whole language in itself. With SFTP & passwordless keys, you won't need it though.

If you have passwordless authentication, you don't need this bit:-

Code:

USER='root'
PASSWD='abc'

I presume that you are putting in the real value of user@server and can do this on the command line to get connected.

Can you show us what output do you get manually and then by running your script? Nothing leaps out as a problem at the moment, but if it's prompting for your credentials, then your haven't got passwordless authentication working, which you will need to do first.

Feel free to over-type anything you deem sensitive.



Robin

I have updated/edited my reply where i have mentioned the actual issue.

I have updated/edited my reply where I have suggested the issue is with an incomplete setup of SSH key exchange to allow passwordless login. Did you make your client public key trusted on the server account that you want to connect to? What is the server OS by the way?

Can you show us the output from both a manual sftp with the user name you want to connect to and the output from your script.


Thanks,
Robin

Try manual sftp and post us the entire log masking the sensitive content