Maybe its an issue about the version I am using, but if the above code does not work for you, try this:

    set -g prefix C-a
    unbind-key C-b
    bind-key C-a send-prefix


As you know, `C-b` is the default prefix in `tmux`. `C-b C-b` is used to send an actual `C-b` character to the terminal. If you switch the prefix to `C-a`, you just need to rebind some keys to update which one sends the `send-prefix` command.

For your `.tmux.conf`:

    # You probably already put this in
    set prefix C-a

    unbind-key C-b
    bind-key C-a send-prefix

I have the following code which easily connects to the FTP server and opens a zip file. I want to download that file into the local system. How to do that?

    # Open the file for writing in binary mode
    print &#39;Opening local file &#39; + filename
    file = open(filename, &#39;wb&#39;)
    
    # Download the file a chunk at a time
    # Each chunk is sent to handleDownload
    # We append the chunk to the file and then print a &#39;.&#39; for progress
    # RETR is an FTP command
    
    print &#39;Getting &#39; + filename
    ftp.retrbinary(&#39;RETR &#39; + filename, handleDownload)
    
    # Clean up time
    print &#39;Closing file &#39; + filename
    file.close()

How to download a file via FTP with Python ftplib

Is there a way to change the properties of a CSS class, not the element properties, using jQuery?

This is a practical example:

I have a div with class `red`

    .red {background: red;}

I want to change class `red` background property, not elements that have class `red` background assigned.

If I do it with jQuery [.css() method][1]:

    $(&#39;.red&#39;).css(&#39;background&#39;,&#39;green&#39;);

it will affect the elements that right now have class `red`. Up to here everything is fine.
But if I make an Ajax call, and insert more divs with `red` class, those won&#39;t have a green background, they will have the initial `red` background.

I could call jQuery [.css() method][1] again. But I would like to know if there is a way to change the class itself. Please consider this is just a basic example.


  [1]: https://api.jquery.com/css/

Change CSS class properties with jQuery

I just move from GNU screen to tmux, in screen when I hit `C-a`, then type `a` again can take me to the beginning of the line, I wonder if I stick with `C-a` in tmux how can I work around this?

If I set key bind of C-b to c-a in tmux how can I move the cursor to the beginning of the line?

<p>I just move from GNU screen to tmux, in screen when I hit <code>C-a</code>, then type <code>a</code> again can take me to the beginning of the line, I wonder if I stick with <code>C-a</code> in tmux how can I work around this?</p>


I&#39;ve been looking around and people say that putting 

    set -g mouse-mode on
should let you scroll through the terminal output when running tmux. However, after both putting this in my `~/.tmux.conf` file and saying `tmux set -g mouse-mode on` when in a tmux session, nothing changes. When I scroll I still get outside of tmux like scrolling in vim with default settings.

Anyone know why this is?

tmux set -g mouse-mode on doesn&#39;t work

Now for copy to system clipboard I have to select via mouse text in tmux window with ```Shift``` key. And then I have to run this command:


    tmux save-buffer - | reattach-to-user-namespace pbcopy

Is any chance to save to system clipboard easier? Key bind or better do that automatically after Shift release.

My tmux config: https://gist.github.com/3641580

How to copy to system clipboard from tmux output after mouse selection?

I know that after I call `(start-server)` inside an existing Emacs session I can then use `emacsclient -c` (on the same computer) to create new frames that connect into that server, so that each new frame created by `emacsclient` has access to the same set of shared state (e.g. buffers).

Most of the documentation I&#39;ve found focuses on the &quot;give me fast access to my local Emacs&quot; use case, and so there are two things that I haven&#39;t seen any details of yet:

1. Can `emacsclient -c` access Emacs servers started by _other_ users, or is it hard-wired to detect only sessions started by my own user?

1. Does Emacs server (directly or indirectly) support remote connections?  That is, is there some way to set up Emacs (possibly involving SSH) that allows calls to `emacsclient -c` on _remote_ machines to have access to the _local_ state of my Emacs server?

(In case you haven&#39;t already guessed, what I&#39;d ultimately like to do is combine the two techniques above to provide rudimentary collaborative editing support.)

----

This is a real-world problem, so here&#39;s what I&#39;m working with:

 - The necessary functionality should be built into Emacs already (23.3.1, 64-bit).  I can stretch to Emacs extensions from the standard Ubuntu repositories, but I&#39;d prefer not to.  (Which I believe rules out _Rudel_, sadly.)
 - No new users or user spoofing.  Solutions should work with the existing set of user accounts, and users must not pretend to be other users (e.g. via `su` or `ssh`).

If it makes any difference, the machines are on a private LAN, have OpenSSH clients and servers installed (and running), and all users can connect to (their own account on) all machines, but they have no shared filesystem.

----

So, does anybody know whether Emacs server can

 * grant access to other users, or
 * provide remote access?

EDIT

As commented in rwb&#39;s answer, it&#39;s clear that the new windows being opened locally by running `emacsclient -c` are actually being created by the *remote* Emacs server process.  That is, `emacsclient` is simply triggering the relevant behaviour in the server.  This causes some issues with incorrect display settings, since the server does not normally have access to the local desktop (see below).  However, I can now connect in to a remote Emacs session if I use the following sequence of commands:

In one terminal, where `1.22.333.44` is the IP address of `remotehost`:

    ssh -t -X remotehost \
      &quot;emacs -nw --eval
       &#39;(progn (setq server-host \&quot;1.22.333.44\&quot; server-use-tcp t) (server-start))&#39;&quot;

Then in another (on the same machine):

    scp remotehost:.emacs.d/server/server /tmp/server-file
    DISPLAY=localhost:10 emacsclient -c -f /tmp/server-file

The `emacsclient` command causes the remote Emacs server (which it finds details of in `/tmp/server-file`) to open up a graphical Emacs window (on the local display) that shares state with the Emacs session on the remote host.  

Since the remote Emacs server was started via `ssh -X`, SSH provides it with access to my local display via a &quot;fake&quot; `:10` display.  The `DISPLAY=:10` passed to it (via `emacsclient`) thus causes a window to be opened on my local desktop.

----

Although the approach above does tick the &quot;Run Emacs server on remote machine, connect to it using `emacsclient` locally&quot; box, it&#39;s very limited.  In fact, it&#39;s not much different to running the server and clients all locally as a single user: the only difference is that the server is now remote, so has access to different system resources.

Unfortunately, launching via `ssh -X` is the only way I&#39;ve been able to successfully open a window on a different machine&#39;s X server:

 - Specifying a basic `DISPLAY=remote:0` gets nowhere (since Ubuntu X servers are started with the `-nolisten tcp` option).

 - Connecting via SSH and then using `DISPLAY=:0` also fails, but this time only due to lack of suitable authentication credentials.  (I believe that&#39;s the case, anyway: the error message cryptically says `No protocol specified` / `Can&#39;t open display`.)

I think that finding a way around the second problem would probably get me a good deal closer to a solution.

----

Having read the posts at http://comments.gmane.org/gmane.emacs.devel/103350 (starting at the &#39;25 Oct 14:50&#39; post, about half way down) I&#39;m starting to wonder if this might be one of the rare things that Emacs cannot do (i.e. is impossible ;-) ).

However, if anyone does have a way to provide access to remote X displays without the permissions error above, I&#39;m still open to persuasion....

**TL;DR**

As pointed out by rwb&#39;s answer, my questions above about whether Emacs can grant remote access have got things backwards.  There&#39;s no real problem with Emacs granting access to other users (`server-use-tcp` and a suitable `server-file` take care of this): rather the problem is **how to allow a process on one machine to open new X windows on other users&#39; X displays** (specifically, the Emacs running `(start-server)` needs to open windows for users who ask it to via `emacsclient -c`).  That answer&#39;s beyond the scope of this question.


**Alternative solution**

As a workaround, we use the following:

 * machine0: `tmux -S /tmp/shared-tmux-socket new-session`
 * machine1..machineN: `ssh -t machine0 tmux -S /tmp/shared-tmux-socket attach`

with suitable file permissions on `/tmp/shared-tmux-socket`.

Then we run a text-mode Emacs in the shared terminal. :-)  This does raise some user-spoofing questions, but at least the host can see everything that the guests are doing.


Using Emacs server and emacsclient on other machines as other users

I&#39;ve been a happy tmux user for a while now but there&#39;s one behaviour that&#39;s bugging me. When I switch panes using ^b-arrow, and then immediately press arrow-up (to get a command from history, for example), the window pane switches again. I understand this can be useful if you want to move through multiple panes quickly, but for me it&#39;s a pain in the backside since I keep ending up in panes I never meant to be in.

So, is there a way to set tmux so that the ^b-arrow command only switches pane *once* and ignores any following arrow key presses?

Split pane switching in tmux: switch once per command

I&#39;m trying to a get a &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;tab&lt;/kbd&gt; and &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;shift&lt;/kbd&gt;+&lt;kbd&gt;tab&lt;/kbd&gt; binding to work inside of a tmux session (I&#39;m also using PuTTY).

I already went through the pains of having to recompile PuTTY so it would send &lt;kbd&gt;ctrl&lt;/kbd&gt; and &lt;kbd&gt;shift &lt;/kbd&gt; correctly. After using &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;v&lt;/kbd&gt;, and I&#39;m able to see that `^[[27;5;9~` and `^[[27;6;9~` are being sent for &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;tab&lt;/kbd&gt; and &lt;kbd&gt;ctrl&lt;/kbd&gt;+&lt;kbd&gt;shift&lt;/kbd&gt;+&lt;kbd&gt;tab&lt;/kbd&gt;, respectively. Is there any way I can get these bound to next-window and previous-window inside of tmux?

Edit:
After some research, I&#39;m thinking I might have to configure xterm to include those keycodes. Any idea how I would go about doing that?

Edit2:
So I found out I can retrieve infocmp and recompile it. I added

`kctab=\E[27;5;9~, kcstab=\E[27;6;9~,`

to the end of it, except now it&#39;s giving me an error. &quot;**entry does not start with terminal names in column one**&quot;

Content Type	Original Author	Original Content on Stackoverflow
Question	mko	View Question on Stackoverflow
Solution 1 - Tmux	user1978011	View Answer on Stackoverflow
Solution 2 - Tmux	chepner	View Answer on Stackoverflow

If I set key bind of C-b to c-a in tmux how can I move the cursor to the beginning of the line?

Tmux Problem Overview

Tmux Solutions

Solution 1 - Tmux

Solution 2 - Tmux

Change CSS class properties with jQuery

How to download a file via FTP with Python ftplib

Attributions