zssh (Zmodem SSH) is a program for interactively transferring files to a remote machine while using the secure shell (ssh). It is intended to be a convenient alternative to scp, allowing to transfer files without having to open another session and re-authenticate oneself.
Files are transferred through the zmodem protocol, using the rz and sz commands.
Of course, one could also make discreet use of the ssh-agent and use scp without re-authenticating (at least not explicitly).
More information on this package can be found on the Debian web site.
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