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linuxbashcommand-line-interfacescp

How to copy files between remotes with params

I want to copy all directories from one remote to another using scp

scp -r -3 remote1:/dir1 remote2:/dir1

But in couple of days i will copy new files. But scp overwrites existing files. Can somebody help me to set right params to copy only those files which are -mtime +N

Thanks

Solution

  • I am not aware of such option in scp. If rsync is an option then try:

    ssh remote1 'rsync -aH /dir1/ remote2:/dir1/'

    If you do not have connection between remote1 and remote2, the task is still possible with rsync, but a whole lot harder. Try this:

    ssh -R 127.0.0.1:12345:remote2:22 remote1 \
    'rsync -e "ssh -p 12345" -aH /dir1 127.0.0.1:/dir1'

    NB: the \ on the first line continues the command to the second line. The command does the following:

    1. ssh -R 127.0.0.1:12345:remote2:22 ... - ssh will bind to 127.0.0.1:1234 and forward all connections trough your machine (where you start the command) to remote2:22.

    2. ... rsync -e "ssh -p 12345" -aH /dir1 127.0.0.1:/dir1 - ssh will start this command on remote1.

    3. rsync -e "ssh -p 12345" - this tells rsync to use ssh on port 12345 to connect to the remote machine.

    4. ... -aH /dir1 127.0.0.1:/dir1 - this makes rsync sync between /dir1 and 127.0.0.1:/dir1.

    So rsync connects to 127.0.0.1:12345 on remote1, ssh forwards this to remote2:22. So your ssh does the proxy-ing between the two hosts. Hope I managed to explain it...