X11 connection rejected because of wrong authentication.

This is a less than completely useful error message; I got it when I 'ssh -X'ed to a Linux host form OSX and tried to 'sudo system-config-securitylevel'.  Here's the actual message

X11 connection rejected because of wrong authentication.
The application 'system-config-securitylevel.py' lost its connection to the display localhost:10.0;
most likely the X server was shut down or you killed/destroyed
the application.

A workaround is to do 'sudo xterm' and then 'mkxauth -m username' and then do the 'system-config-securitylevel'.
I don't have a clue as to why and don't have time to figure it out...

Update: a better approach is probably "sudo -- sh -c 'mkxauth -m beaty; command"

Another update: under debian "xauth merge /home/beaty/.Xauthority"

Useful Windows links

I ran into a weird situation where Add or Remove Programs had a huge blank space; the following fixed it: http://blogs.msdn.com/b/oldnewthing/archive/2005/05/26/422076.aspx

In the process of hunting this down, I also found that the great CCleaner needs to be run multiple times to completely clean out a registry...

Add total folder size to listing: http://windowsxp.mvps.org/foldersize.htm

Linux minimal printer install

yum install cups
yum install gutenprint-cups
yum install system-config-printer

$DISPLAY not set for ssh -X

Ran into an one i hadn't seen around this; had all the right settings in /etc/ssh/sshd_config for X forwarding on a minimal server, but still no joy.  Did a 'yum install xauth' and life was good again.

Quick source code searching on Linux

While working on a fix in the JDK, I wanted to find all occurrences of a string in large collection of Java source.  I ended up using http://swish-e.org/  Its default file type is *ML, so a simple config file of:

IndexOnly .java
IndexContents TXT* .java

did the trick.  'swish-e -c swish-e.con -i .' and then 'swish-e -w word' -- blazingly fast.

Building OpenJava 7 on Ubuntu 11

sudo apt-get install mercurial
hg clone http://hg.openjdk.java.net/jdk7/jdk7
cd jdk7
sh -x ./get_source.sh

sudo aptitude install openjdk-6-jdk gcc-4.2 g++-4.2
sudo aptitude install libmotif-dev
sudo apt-get install ant
sudo apt-get install libasound2-dev
sudo apt-get install libfreetype6-dev
sudo apt-get install gawk
sudo apt-get install libxext-dev
sudo apt-get install libxrender-dev
sudo apt-get install libxtst-dev
export LANG=C ALT_BOOTDIR=/usr/lib/jvm/java-6-openjdk
make ALLOW_DOWNLOADS=true

Then a 'make ALLOW_DOWNLOADS=true' gets things rolling.  Not sure why this isn't documented anywhere that was easy to find. One can also go to http://jdk7.java.net/download.html export LANG=C export ALT_BOOTDIR=/home/beaty/jdk1.7.0_04 export ALT_JDK_IMPORT_PATH=/home/beaty/jdk1.7.0_04 export ALT_HOTSPOT_IMPORT_PATH=/home/beaty/jdk1.7.0_04

Saeco Via Venezia and espresso pods

We have one of these machines at work, and it some experimenting on how to use it with pods.  The instructions left much to be desired.  So, put the rubber adapter in first, then the single shot basket, then the pod.  Here's a picture: