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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
# 1  
Old 07-03-2012
Avoiding file overwrite during file transfer using scp
Hi,
I have written a small script to transfer a file from one unix server to other using scp command which is working fine. As I know with scp, if any file with the same name is already present on destination server, it would get overwritten without any notification to user. Could anyone help me getting a notification before file gets overwritten?
# 2  
Old 07-03-2012
Hello,

In your case I would use rsync with --ignore-existing option.

Hope it helps you Smilie
# 3  
Old 07-03-2012
If you want to carry on using your own script and scp, you could put a test condition in before the scp command along the lines of:

if <filename> exists on target server, mv target-server:<filename> target-server:<filename>.bak

then scp .....
# 4  
Old 07-04-2012
Can sftp help? Doe sit also overwrite?

---------- Post updated at 02:31 AM ---------- Previous update was at 02:18 AM ----------

Hi spynappels,

can you give me exact code for this? my code looks like:


Code:
cd $LOCALDIR
scp -r $LOCALDIR$FILENAME $LOGIN@$REMOTESERVER:$REMOTEPATH$FILENAME

Last edited by zaxxon; 07-04-2012 at 07:09 AM..
# 5  
Old 07-04-2012
You could use something like this:

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

sftp will also overwrite files, it's pretty much the same as scp.
# 6  
Old 07-04-2012
It's giving error. I used:

Code:
ssh $LOGIN@$REMOTESERVER "cd $REMOTEPATH; if [ -f $FILENAME ]; then echo "Data file exists" |mv $FILENAME $FILENAME.bkp | mailx -s "File already existed so renamed to filename.bkp and new file is being copied" "abc@abc.com" ; else echo "data file does not exist" | mailx -s "File didn't exist so being copied." "abc@abc.com" ; fi"

I am getting error like LOCALDIR is unknown variable which is used in scp command below it


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data.
Last edited by zaxxon; 07-04-2012 at 07:09 AM.. Reason: code tags
# 7  
Old 07-04-2012
I'm not sure why you are getting that error, you are not even referencing that variable in the line you gave for the ssh command?

You must have set $LOCALDIR earlier as it was referenced in the first line you gave me, are you sure it has been set correctly?

Also, as an aside, it may be better to place your echo text in single quotes, as you are already using double quotes in your ssh command.
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