On Fri, Jan 11, 2019 at 10:48:54PM -0500, Stewart Smith wrote:
The one thing I miss from screen is built in zmodem
capture. Okay, so this
is a bit esoteric these days, and I guess I should not complain about it and
instead send a patch to tmux :)
I'd forgotten that screen could even do that. It's been years since I even
used zmodem, possibly decades.
Seems you're not the first to miss it:
The responses so far have been "No way, this is not what tmux is for" and
"tmux has nothing to do with uploading files". The response may be more
positive if accompanied by a working patch :)
If you're going to send a patch, I'd suggest making two generic features
rather than hard-coding support for zmodem.
1. Add an ability to allow tmux to run a program and pipe the output into
the terminal. e.g. run "rz" inside the terminal and then have tmux run "sz
filename" to upload a file. This would have many other uses, like running
"vi" in the terminal and typing "i" or "o" in vi, then
having tmux run "cat
2. Add an ability to pipe all input from the terminal into a command until
that command terminates. e.g. run "sz filename" in the terminal and then
have "tmux" run "rz".
For programs like rz that are able to detect the end of their input, this
isn't terribly complicated, but it would be much more complicated for programs
that just keep on hoovering up stdin until stdin closes - e.g. "cat filename"
inside the terminal while tmux runs "xsel -i". Another tmux command to
manually close the input to the running external program would be clumsy but
3. An obvious third feature would be programmable triggers to run commands.
e.g. if tmux sees a particular sequence of characters, then run a particular
program. e.g. "**B00000000000000" could trigger running "rz". I
this would probably be quite difficult, and would probably have a noticable
impact on tmux's performance.
BTW, there's an ssh wrapper called zssh:
Depends: lrzsz, openssh-client | telnet | telnet-ssl, libc6 (>= 2.27), libreadline7
Description-en: interactive file transfers over ssh
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
The main benefit I can see (for either zssh, or zmodem support in tmux) is
that due to firewalls, NAT, etc it's often MUCH hard to connect back to the
origin host with scp or ftp or whatever, than it was to connect from the
origin host to the remote host in the first place. OTOH, that's one of the
uses for ssh port-forwarding.
There's a Q&A on stackoverflow showing how to do it even from within your
current ssh session (i.e. without having to set up port-forwarding when you
started ssh) with ssh tilde commands.
craig sanders <cas(a)taz.net.au>