Colors

Text Panel

Close Terminal when shell exits

Shell panel

Behavior of Page Up/Down, Home & End

Keyboard Panel

in the Keyboard pane of the Preferences window. In addition this also set Ctrl Left and Ctrl Right to Home and End within the Terminal App as used in many other OS X applications. To get the \033 in the Action windows press esc. The bash shell understands most of this commands without extra configuration but to get e.g. the history search to work you should create an .inputrc file in your home directory with the following content:

# do not bell on tab-completion
set bell-style none
# enable 8bit input
set input-meta on
# disable stripping of 8bit characters
set convert-meta off
# enable 8bit output
set output-meta on
# show multiple possibilities on tab completion
set show-all-if-ambiguous on
# set file completion case-insensitive
set completion-ignore-case on
# completes names which are symbolic links to directories with slash appended
set mark-symlinked-directories on

"\e[1~": beginning-of-line
"\e[4~": end-of-line
"\e[5~": history-search-backward
"\e[6~": history-search-forward
"\e[3~": delete-char
"\e[5C": forward-word
"\e[5D": backward-word

Besides of configure the correct key assignments this also sets some comfort features and 8bit support of the bash. Feel free to adopt it to your needs. You can find more information on the official manual page.

UTF8 support for remote SSH connections

When you connect to other machines via the OS X ssh client you might notice that on some of them the UTF-8 support is broken. This is because OS X Lion enables the transmission of the LC_* environment settings by default. As some systems
don't know the "UTF-8" LC_CTYPE locale some problems may occur. To avoid this edit the /etc/ssh_config file (Don't forget to sudo) and comment the line

   SendEnv LANG LC_*

by adding an #.

Colored bash & Terminal Window Title

The standard OS X bash is black and white. To get a colored one I adopted my .profile from my Gentoo system. Just create a .profile file in your home-directory with the following content

#!/bin/bash

# Change the window title of X terminals
case ${TERM} in
        xterm*|rxvt*|Eterm|aterm|kterm|gnome*|interix)
                PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME%%.*}:${PWD/$HOME/~}\007″‘
                use_color=true
                ;;
        screen)
                PROMPT_COMMAND=’echo -ne “\033_${USER}@${HOSTNAME%%.*}:${PWD/$HOME/~}\033\\”‘
                use_color=true
                ;;
esac

if ${use_color} ; then
        # set color prompt
        if [[ ${EUID} == 0 ]] ; then
                PS1=’\[\033[01;31m\]\h\[\033[01;34m\] \W \$\[\033[00m\] ‘
        else
                PS1=’\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] ‘
        fi

        # enable ls colors
        alias ls=’ls -G’
        # enable grep color
        alias grep=’grep –colour=auto’
else
        if [[ ${EUID} == 0 ]] ; then
                # show root@ when we don’t have colors
                PS1=’\u@\h \W \$ ‘
        else
                PS1=’\u@\h \w \$ ‘
        fi
fi

# Try to keep environment pollution down
unset use_color

This sets a colored bash prompt and creates alias for ls and grep to use the colored version. Also the window title of the Terminal App is updated after each command with the current username and path.

bash History

When you're already editing your .profile file you could also add

# improve bash history
shopt -s histappend
PROMPT_COMMAND=$PROMPT_COMMAND';history -a'
# Store 10000 commands in bash history
export HISTFILESIZE=10000
export HISTSIZE=10000
# Don't put duplicate lines in the history
export HISTCONTROL=ignoredups

to the end of the file to increase the size of the bash History a little bit.

WordPress seems to change some of the quotes in the text to pretty quotes. To avoid problems you can download my complete .profile File.

brew install gphoto2

Homebrew will install some libraries and gphoto2. Now we can switch on the camera and connect it by USB. If we ask gPhoto2 to query all support config options by

gphoto2 --list-config

we might receive an error like

An error occurred in the io-library ('Could not claim the USB device'): Could not claim interface 0 (m). Make sure no other program or kernel module (such as sdc2xx, stv680, spca50x) is using the device and you have read/write access to the device.
*** Error (-53: 'Could not claim the USB device') ***

This is because OS X starts the Picture-Transfer-Protocol daemon which occupies the device. We can quit the daemon by

killall PTPCamera

If we now try again to readout the support config options by

gphoto2 --list-config

we should receive a list like

/main/actions/bulb
/main/actions/uilock
/main/actions/syncdatetime
/main/actions/autofocusdrive
/main/actions/manualfocusdrive
/main/actions/eoszoom
/main/actions/eoszoomposition
/main/actions/eosviewfinder
/main/settings/datetime
/main/settings/reviewtime
/main/settings/output
/main/settings/evfmode
/main/settings/ownername
/main/settings/artist
/main/settings/copyright
/main/settings/capturetarget
/main/settings/capture
/main/status/model
/main/status/ptpversion
/main/status/batterylevel
/main/status/lensname
/main/status/serialnumber
/main/status/shuttercounter
/main/status/availableshots
/main/imgsettings/imageformat
/main/imgsettings/imageformatcf
/main/imgsettings/imageformatexthd
/main/imgsettings/iso
/main/imgsettings/whitebalance
/main/imgsettings/whitebalanceadjusta
/main/imgsettings/whitebalanceadjustb
/main/imgsettings/whitebalancexa
/main/imgsettings/whitebalancexb
/main/capturesettings/exposurecompensation
/main/capturesettings/autoexposuremode
/main/capturesettings/drivemode
/main/capturesettings/picturestyle
/main/capturesettings/shutterspeed
/main/capturesettings/meteringmode
/main/capturesettings/bracketmode
/main/capturesettings/aeb
/main/other/d402
/main/other/d407
/main/other/d406
/main/other/d303

Now, we can read out one of these config options, e.g. the shutter count, by running

gphoto2 --get-config /main/status/shuttercounter

which results in

Label: Shutter Counter
Type: TEXT
Current: 4930

The 4930 fits perfectly to the number of pictures I made with my Canon EOS 7D.

There is a nice talk from Linus Torvalds about git on youtube which explains the idea of git and differences to popular version control systems like CVS or subversion.

Update (2009-08-10): A few days ago, I moved my projects to github.

Today I got an request by email to include support for integer conversion from YUV422 to RGB as descriped by Wikipedia. So I included it and did some style adjustments, too.

You can download it here: v4l2grab Version 0.2

To use integer conversion you have to compile with an additional

-DNTSC

for NTSC like conversion or

-DITU_R_INT

for ITU-R integer conversion. Both standars are explained in the referenced wikipedia article. The use of

-DITU_R_FLOAT

uses the previous floating point version of ITU-R which is default if no compiling options are specified. More information about compilation can be found on the original post.

The current version of V4L2grab can be found on github.

Since Kernel 2.6.27 most of the USB webcams are supported through the Linux UVC drivers, which provides an Video4Linux2 Interface to those cams. We found some programs who claimed being able to grab JPEG images from V4L2 Cams, but most of them either didn’t compile, supported only V4L Version 1 or just brought up some other errors.

So I checked up the Video for Linux Two API Specification and found there in Appendix B a small sample of howto communicate with the Cam. I adapted it to our needs and included an converter from YUV colorspace to RGB. Finally I added some code to support the export of JPEG images.

You can download it here: v4l2grab Version 0.1

The whole program is written in C and only needs libjpeg to compile. There are different ways to communicate with the camera, if you want to support all, you should go best with:

gcc v4l2grab.c -o v4l2grab -Wall -ljpeg -DIO_READ -DIO_MMAP -DIO_USERPTR

If you compiled the program, you can get some images with:

./v4l2grab -o image.jpg

With -W width -H height its possible to adjust the size of the image. If the camera doesn’t support the resolution the programs adjusts it automatically and prints an information on stderr.

The current version of V4L2grab can be found on github.

But wget prefers IPv4 over IPv6, meaning if your download mirror supports IPv6, wget doesn’t use it by default. You can change this behavior by setting

prefer-family = IPv6

either in /etc/wgetrc for everybody or in $HOME/.wgetrc for a user only.

So enable it and tell portage to use an IPv6 enabled mirror, by setting GENTOO_MIRROR in /etc/make.conf. You’ll find a list of IPv6 capable mirrors on gentoo.org (look for mirrors marked with *).

Um meine Protokolle trotzdem veröffentlich zu können habe ich mir ein kleines Bash-Script geschrieben, welches eine Platzhaltergrafik im PostScript Format erzeugt, die sich dann leicht in LaTex oder PdfTex (via epstopdf) einbinden läßt. Rechts ist eine Beispielausgabe zu sehen, welche ich mit

mkcopyrightimg 300 200 20 "Removed due to copyright" "http://www.twam.info"

erzeugt habe. Es gilt zu beachten das die 3 Größenangaben in der Einheit Punkt (entspricht 1/72 Zoll) gemacht werden müssen und in den beiden Textstrings #,(,) und \ mit \ escaped werden müssen.

Das Skript kann unter mkcopyrightimg runtergeladen werden.

Außer der reinen Darstellung der Information kann das Addon auch auf bestimmte Dinge reagieren. So kann es z.B. warnen falls der Browser nicht aktuell ist oder noch IPv4 verwendet wird. Bei was gewarnt werden soll und was überhaupt angezeigt werden soll, kann einfach im Administrationsbereich eingestellt werden.

Zur Bestimmung des Browser habe ich dazu Browscap verwendet. Die Bestimmung des Ortes aus der IP-Adresse übernimmt GeoIP.

Das Plugin läßt sich rechts oben in Aktion sehen. Es warnt im Moment bei alten Browsern. Die IPv4 Warnung ist im Moment noch deaktiviert, solange die IPv6 Anbindung des Servers noch nicht vollständig ausgetestet ist.

Im Rahmen des Google over IPv6 Programms bietet Google aber größeren IPv6-Providern die Möglichkeit ihren DNS als “trusted tester” zu registrieren und dann für alle Google Services AAAA Records bereit zustellen.

SiXXs bietet nun seit gestern die Möglichkeit, dies über ihre DNS Server zu nutzen, wenn man sie aus einem SiXXs-Subnet anfragt. Das musste natürlich sofort getestet werden und siehe da:

server ~ # dig AAAA www.google.de
; <<>> DiG 9.6.0-P1 <<>> AAAA www.google.de
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32996
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 13, ADDITIONAL: 12

;; QUESTION SECTION:
;www.google.de.                 IN      AAAA

;; ANSWER SECTION:
www.google.de.          303016  IN      CNAME   www.google.com.
www.google.com.         391617  IN      CNAME   www.l.google.com.
www.l.google.com.       284     IN      AAAA    2001:4860:a005::68

Ich bin gespannt, wann andere große Websiten nachziehen.

Das Firefox Addon ShowIP zeigt in der Status-Leiste des Firefox die aufgerufe IP-Adresse des Servers an und färbt sie rot falls es sich um eine IPv4 handelt und grün wenn der Server schon IPv6 versteht.

IPv6 oder IPv4?

Testen läßt sich das zum Beispiel unter ipv6.google.com oder www.six.heise.de.

Das Programm AICCU initialisiert die Tunnel und benötigt als Konfiguration lediglich SiXXs-Benutzername und Passwort sowie eine Tunnel Nummer. Das Programm gibt es als net-misc/aiccu als Ebuild für Gentoo.

Ist der Tunnel erfolgreich eingerichtet kann auch ein IPv6 Subnet beantragt werden und weitere PCs im Heimnetz ans IPv6 Netz zu bekommen. Der Gentoo-IPv6-Router-Guide erklärt wie man radvd und dhcpv6 konfiguriert.

This window is usually positioned in the upper right corner of your screen beside the minimize and maximize buttons of the underlaying applications (but you can configure the window to reside whereever you want!). If you use the “always on top” feature of worldclock, you’ll be able to see the different timezones all the time without loosing import space on your screen.

In Version 3 there are lots of features which you can configure so that worldclock fits your needs, e.g. you can change to look of the main screen completely. Select your own colors, fonts, border and padding settings or even display the window transparent:

Version 3 of WorldClock has also a lot of new features for managing your timezones. You can select your timezones from a lot of predifined timezones or create your own using the “new timezone wizard”:

If you add a custom timezone you will be able to select a country to use the daylightsavingtime rules of this country.

Another nice feature of worldclock is its included timecalc. You can launch it easily via a user-configurable hotkey. It helps you to plan your meetings, when your participants are using different timezones:

And the best on worldclock is that it’s for free! So download and try it! If you like it, feel free to give me a short feedback on it! I’d be happy!

Download: setup_332.exe