Master connectionIt's easiest if you plan in advance.Open a master connection the first time. For subsequent connections, route slave connections through the existing master connection. In your, set up connection sharing to happen automatically: ControlMaster autoControlPath /.ssh/control:%h:%p:%rIf you start an ssh session to the same (user, port, machine) as an existing connection, the second session will be tunneled over the first.
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Establishing the second connection requires no new authentication and is very fast.So while you have your active connection, you can quickly:. copy a file with scp or rsync;.ForwardingOn an existing connection, you can establish a reverse ssh tunnel. On the ssh command line, create a remote forwarding by passing -R 22042:localhost:22 where 22042 is a randomly chosen number that's different from any other port number on the remote machine. Then ssh -p 22042 localhost on the remote machine connects you back to the source machine; you can use scp -P 22042 foo localhost: to copy files.You can automate this further with RemoteForward 22042 localhost:22.
The problem with this is that if you connect to the same computer with multiple instances of ssh, or if someone else is using the port, you don't get the forwarding.If you haven't enabled a remote forwarding from the start, you can do it on an existing ssh session. Type Enter C Enter -R 22042:localhost:22 Enter.See “Escape characters” in the manual for more information.There is also some interesting information in. Copy-pasteIf the file is small, you can type it out and copy-paste from the terminal output. If the file contains non-printable characters, use an encoding such as.remote.example.net$ base64 myfile(paste the clipboard contents) Ctrl+ DMore conveniently, if you have X forwarding active, copy the file on the remote machine and paste it locally. You can pipe data in and out of. If you want to preserve the file name and metadata, copy-paste an archive. Remote.example.net$ tar -czf - myfile xsellocal.example.net$ xsel tar -xzf.
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SSH does support a few commands, via the escape character ( by default): $ ?Supported escape sequences:. terminate connection (and any multiplexed sessions)B - send a BREAK to the remote systemC - open a command lineR - Request rekey (SSH protocol 2 only)^Z - suspend ssh# - list forwarded connections& - background ssh (when waiting for connections to terminate)?
- this message - send the escape character by typing it twice(Note that escapes are only recognized immediately after newline.)$ Cssh helpCommands:-Lbindaddress:port:host:hostport Request local forward-Rbindaddress:port:host:hostport Request remote forward-Dbindaddress:port Request dynamic forward-KRbindaddress:port Cancel remote forward!args Execute local commandThe!args seems to be closest to what you want. Note that you'll need to have PermitLocalCommand enabled in your /etc/sshconfig file in order for the C commands to work (see man sshconfig).You can re-use the same ssh session if you set up a ControlMaster in sshconfig. If you do this: $ Cssh!scp file user@myserver:you've technically never left the ssh session, and don't need to re-authenticate. Probably more complicated than you'd like, but I can't think of another easy way. Use, a modified ssh-agent which effectively overloads an existing ssh side-channel for file-transfer use.
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Use, which is effectively zmodem over ssh. If you've ever used rzsz this will seem very familiar. Reverse ( -R, for remote-to-local) or forward ( -L, for local-to-remote) ports to run file transfers over, assuming you have some file-transferring daemon listening on the other end.But none of these are really needed, IMO. The SSH protocol supports multiple channels on a single connection, and the OpenSSH client supports multiplexing. Assuming you have ControlMaster and ControlPath ( ControlPersist is useful too), # first connection$ ssh remote# will multiplex over the same connection the original ssh opened$ sftp remote.
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