====== Screen and Other Settings For a New Host ======
<toc><ul><li><link topicref="2">GNU/screen</link><ul><li><link topicref="3">auto-title for screen</link></li></ul></li><li><link topicref="4">SSH keepalive</link></li><li><link topicref="5">TCP keepalive</link></li></ul></toc>
====== GNU/screen ======
<uri strref="http://www.wlug.org.nz/Screen"/>

<strong>~/.screenrc</strong>:

<code>
startup_message off
bind ' ' windowlist -b
defscrollback 5000
defmonitor on
hardstatus alwayslastline
caption always
caption string '%-Lw%{= BW}%50&gt;%n%f* %t%{-}%+Lw%&lt;'
shelltitle '$ |bash'
</code>
<list><ul><li>Ctrl-A 'space' brings up the list of running windows</li><li>Ctrl-A c - create a new window</li><li>Ctrl-A ? - list of more screen commands</li><li>Ctrl-A k - kill the current window (when using screen as a serial console 'screen /dev/ttyUSB0 9600')</li></ul></list>
<h2>auto-title for screen</h2>
This sets the window title to the command you are currently running on localhost.

<strong>~/.bashrc</strong>:

<code>
...
PROMPT_COMMAND='echo -n -e &quot;\033k\033\\&quot;'
</code>
The following sets the screen title to the ssh host you have connected to.

<strong>~/.ssh/config</strong>:

<code>
Host *
    PermitLocalCommand yes
    LocalCommand tty -s &amp;&amp; echo -ne &quot;\ek%h\e\\&quot;
</code>
(On every ssh connection 'LocalCommand' is run, which formats the remote hostname into the needed escape sequence for screen to set the window title).

====== SSH keepalive ======
To keep SSH sessions from timing out:

<code>
Host *
    ...
    TCPKeepAlive yes
</code>
====== TCP keepalive ======
To keep all TCP sessions from timing out:

<code>
# sysctl -w net.ipv4.tcp_keepalive_time=200
# echo net.ipv4.tcp_keepalive_time=200 &gt;&gt; /etc/sysctl.conf
</code>