New post (terminal multiplexing and ssh), switch to using gists for embedded code.

Author: logic

_posts/2009-12-13-kerberos-and-ksu.html

@@ -15,42 +15,4 @@
 
 <p>So, I fixed both of those a while back, with a really ugly shell script. Just in case anyone else might find it handy, here it is:</p>
 
-{% highlight bash linenos=table anchorlinenos=True lineanchors=ksu %}
-#!/bin/sh
-
-# Replacement for raw "ksu" in kerberized environments;
-# behaves more like "su -", and retains xauth data.
-
-if [ $# -lt 1 ]
-then
-    echo "Usage: `basename $0` <target user> [ <command> [ <arg> ] ... ]"
-    exit 2
-fi
-
-TARGET_USER="$1"
-shift
-
-# be a basic login shell if no command is specified.
-if [ -z "$*" ]
-then
-    TARGET_CMD='-l'
-else
-    TARGET_CMD="-c '$*'"
-fi
-
-# FD 4 becomes stdin
-exec 4>&0
-
-xauth list | sed -e 's/^/add /' | {
-    # FD 3 becomes xauth output
-    # FD 0 becomes stdin again
-    # FD 4 is closed
-    exec 3>&0 0>&4 4>&-
-
-    exec /usr/bin/env -u PATH -u LD_LIBRARY_PATH \
-      /usr/krb5/bin/ksu "${TARGET_USER}" -e /bin/bash -l -c "
-        xauth -q <&3
-        cd
-        exec /usr/bin/env DISPLAY='${DISPLAY}' "'"$SHELL"'" ${TARGET_CMD} 3>&-"
-}
-{% endhighlight %}
+<script src="https://gist.github.com/906849.js"> </script>

_posts/2010-09-17-bash-history.html

@@ -10,11 +10,7 @@
 ---
 <p>A quick random Linux administration tip: add the following three lines to <kbd>root</kbd>'s <kbd>.bashrc</kbd>:</p>
 
-{% highlight bash linenos=table anchorlinenos=True lineanchors=bashhist %}
-[ ! -d $HOME/.history ] && mkdir $HOME/.history
-set -- `/usr/bin/who -m`
-HISTFILE="$HOME/.history/`/bin/date +%Y-%m-%d.%T`.`/bin/hostname -s`.$$.$1"
-{% endhighlight %}
+<script src="https://gist.github.com/906847.js"> </script>
 
 <p>Once you do, future login sessions as root will be saved in a directory named <kbd>.history</kbd> in <kbd>root</kbd>'s home directory, in the pattern:</p>
 

_posts/2012-02-15-terminal-multiplexing-and-ssh.html

@@ -0,0 +1,19 @@
+---
+layout: post
+title: "Terminal multiplexing and SSH"
+date: 2012-02-15 10:30:00
+categories:
+  - linux
+  - bash
+  - shell
+  - screen
+  - tmux
+  - ssh
+---
+<p>Tools like <a href="http://tmux.sourceforge.net/">tmux</a> and <a href="http://www.gnu.org/software/screen/">screen</a> are fantastic for doing work on remote systems: you can open up multiple sessions, fire off jobs, disconnect, and come back later, and things are still as you left them. However, if you use <a href="https://en.wikipedia.org/wiki/Ssh-agent">ssh-agent</a> for credential forwarding, you've probably noticed a downside: after disconnecting and reconnecting, the environment variables that ssh and friends use to figure out how to talk to ssh-agent are now wrong</p>
+
+<p>There's a million different ways to solve this; here's my take on it:</p>
+
+<script src="https://gist.github.com/1837945.js"></script>
+
+<p>Adding this to your <kbd>.bash_profile</kbd> (or <kbd>.bashrc</kbd>, depending on your local setup) will add aliases for both <kbd>tmux</kbd> and <kbd>screen</kbd>, which will save the four SSH-related environment variables you'll want to override inside of your terminal multiplexor to a file in your home directory. It also adds aliases for <kbd>ssh</kbd>, <kbd>scp</kbd>, and <kbd>sftp</kbd>, which forces the saved variables to be loaded prior to execution.</p>