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Avoiding file overwrite during file transfer using scp

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Top Forums Shell Programming and Scripting Avoiding file overwrite during file transfer using scp
# 8  
Old 07-04-2012
I tried the code given by you:

Code:
cd $LOCALDIR
ssh $LOGIN@$REMOTESERVER "cd $REMOTEPATH; if [ -a $FILENAME ]; then mv $FILENAME $FILENAME.bak; fi"
scp -r $LOCALDIR$FILENAME $LOGIN@$REMOTESERVER:$REMOTEPATH$FILENAME

But ssh command is not running. It's just copying the file there by overwriting existing one but not creating back up file (as it should do as per second line of code). No error also.
# 9  
Old 07-04-2012
I'm not sure what is going wrong then, I suspect there is some issue with the ssh statement.
I ran the same logic on a test box and got the following output, so I know the statement works as intended:

Code:
stefan@stefan-Latitude-E6420:~$ remote="/etc/network"
stefan@stefan-Latitude-E6420:~$ filename="foobar"
stefan@stefan-Latitude-E6420:~$ ssh root@10.5.113.88 'ls /etc/network/foo*'
/etc/network/foobar
stefan@stefan-Latitude-E6420:~$ ssh root@10.5.113.88 "cd $remote; if [ -a $filename ]; then mv $filename $filename.bak; fi"
stefan@stefan-Latitude-E6420:~$ ssh root@10.5.113.88 'ls /etc/network/foo*'
/etc/network/foobar.bak
stefan@stefan-Latitude-E6420:~$

If I then did an scp of foobar from Latitude to 10.5.113.88, a ls of /etc/network/foo* on 10.5.113.88 would show both files.

Can you include some debug echo statements in your code and see where it fails?
# 10  
Old 07-05-2012
Thanks Spynapples.

One more thing, when I transfer the file using scp, it asks for the password at run time. Is there any way to transfer the file using scp non interactively? Need to automate it.
# 11  
Old 07-05-2012
Normally if you have key based authentication for SSH, SCP will use this as well. Have you set up key based authentication to the remote server?
# 12  
Old 07-05-2012
no not yet. How can I do that?
# 13  
Old 07-05-2012
See:

ssh-keygen: password-less SSH login
# 14  
Old 07-05-2012
I recommend creating an RSA keypair as shown in the link Jim provided.

To copy the public key to the remote host, check if your system has the ssh-copy-id utility available:

Code:
ssh-copy-id remote-user@remotehost

will copy your public key into the .ssh/authorized_keys file in remote-user's home directory in one simple step.

If that utility is not available, you'll need to copy it manually.
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