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Uninstalling applications in Mac OS X is very different than uninstalling in a Microsoft Windows environment because Mac OS X has nothing like the Windows Registry. While most Windows programs include an uninstaller that can be run through using the Add/Remove Programs control panel, no such feature exists in Mac OS X and so most users simply move application bundles (see below) to the Trash. However, often times there is more to uninstalling than a simple drag-and-drop to the trash. This article will guide you on how to fully uninstall applications.

Application Bundles

Most Mac OS X applications (anything that ends in .app), like Safari and iTunes, are bundles. The application icon you see in Finder (typically the Applications Folder) is usually a special folder itself, made to appear as a single double-clickable file. These "folders" contain all, or at least most, of the files needed to run the application, ie they are self-contained. This means that to uninstall these applications, you only have to drag them to the Trash. If you control-click (or right-click) on an Application icon, and you see "Show Package Contents", then it is a bundle.

Additional Files

Applications will leave behind preference files, and sometimes application support files, neither of which are stored in application bundles. Preference files can be safely deleted, but they usually take up negligible disk space — and, if you decide to reinstall the application again later, keeping the preference file means your settings will still be there. They are stored in the Preferences folder within your user's Library folder (~/Library/Preferences), or may also be stored in the system-wide Library located at the root of the system volume (/Library/Preferences/).

Application support files can take up anywhere from a few kilobytes to several gigabytes of space, depending on the application installed. Examples of applications that have large support files are multimedia programs such as Garageband and DVD Studio Pro. They are located in the Application Support folder within your user's Library folder, or in "/Library/Application Support/".

To remove an application's icon from the dock make sure that the program is not running at the time, then simply drag the icon off of the dock and let go. There will be a puff of smoke animation and the icon will be gone. This will only remove the dock icon/shortcut, and will not touch the application itself or any of its support files.

Applications with Installers/Uninstallers

If you ran an installer to install an application, you may wish to try running the installation program again to see if an uninstall option is available at any point during installation (many times in a drop-down menu). Check the installation CD or disk image for the original installer file. Some vendors have included simple Perl scripts that will run in the command line to uninstall applications, and may be named "uninstaller.pl".

Useful Links

http://www.favicon.cc/

http://cubic.bioc.columbia.edu/eva/doc/explain_methods.html#type_sec

Removing previous MySQL installations

sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
(Edit /etc/hostconfig) sudo vi /etc/hostconfig (Remove line MYSQLCOM=-YES)
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /var/db/receipts/com.mysql.*

Download mysql for Mac OSX from:

http://www.mysql.com/downloads/mysql/

Installation guide from Apple:

http://developer.apple.com/internet/opensource/osdb.html

MySQL MacOSX Binary installation and adding startup items

# create the directory where you will keep your MySQL binary distribution
mkdir ~/src
cd ~/src
 
# download mysql binary distribution from http://dev.mysql.com/downloads/mysql/
# then move the distribution into your src directory
mv /path/to/mysql/download.tar.gz ~/src
# make sure you are in ~/src (use pwd if unsure) then untar
gunzip < /path/to/mysql-VERSION-OS.tar.gz | tar xvf -
 
# create the MySQL group
dscl . create /Groups/mysql
# give it some group id
dscl . create /Groups/mysql gid 296
# create a MySQL user
dscl . -create /Users/mysql
# make the MySQL user a member of the MySQL group
dscl . append /Groups/mysql GroupMembership mysql
# change ownership to mysql
chown -R mysql .
chgrp -R mysql .
 
# install mysql
scripts/mysql_install_db --user=mysql
# make a symlink in the /usr/local directory or you can customize the location in support-files/mysql.server if you prefer
mkdir /usr/local
cd /usr/local/
ln -s /full/path/to/your/mysql/install/directory mysql
 
# you should now be able to start the server
support-files/mysql.server start
 
# add mysql to your PATH
# in ~/.bash_profile
export PATH=/usr/local/mysql/bin:$PATH
source ~/.bash_profile
# should bring up the mysql CLI
mysql
# exit 
mysql> exit
 
# set mysql server to auto start upon boot
mkdir /Library/StartupItems/MySQLCOM
cd /Library/StartupItems/MySQLCOM/
ln -s /usr/local/mysql/support-files/mysql.server MySQLCOM
 
# test for success
/Library/StartupItems/MySQLCOM/MySQLCOM stop
/Library/StartupItems/MySQLCOM/MySQLCOM start
 
# create a root password
mysqladmin -u root password your_root_password

Installation from sources from official doc

WEB references

Tony Amoyal

Kernel version and information:

lsb_release -a  -   E.g.  Distributor ID: Ubuntu    Description: Ubuntu 8.04.4 LTS Release: 8.04 Codename: hardy

Graphics card:
glxinfo – details about OpenGL, the Xserver, and your graphics card
glxinfo | grep direct – do you have direct 3d rendering?
glxinfo | grep vendor – graphics card vendor
lspci | grep VGA – specific graphics card model
glxgears – a simple 3d benchmark, prints frame rate to the terminal
xrandr – supported display resolutions

Audio:
lspci | grep Audio – audio controller
aplay --list-devices – more audio device information

Software versions:
cat /etc/issue – current distribution and version
apt-cache showpkg packagename – packagename’s version and dependencies
uname -r - Linux kernel version
uname -a – all kernel details

Networking:
lspci | grep Ethernet – Ethernet controllers
ifconfig – networking interfaces, IP addresses, and more

Processor:
cat /proc/cpuinfo – all processors, clock speeds, flags, and more
cat /proc/loadavg – processor load average for the last 1, 5, and 15 minutes
top – press C key to sort processes by CPU usage

Memory:
cat /proc/meminfo – amount of RAM and swap, and how much is being used for what
free -m – total, used, and free memory shown in MB
top – press M key to sort processes by memory usage

Hard disks:
df -H – partitions, as well as their mount-points and usage in GB
sudo fdisk -l – all partitions, their device names, and positions on disk

USB devices:
lsusb – USB buses and attached devices

Even more:
lshal -m – monitor for hardware changes
lspci – all PCI devices
hwinfo --short (install from package hwinfo) – overview of all hardware, as well as more detailed info
lshw – another program for listing hardware
lshw -html | w3m -T text/html – lists hardware with HTML output in the w3m web browser
uptime – current time elapsed since last reboot, users, and load average

http://tombuntu.com/index.php/2008/01/31/dig-up-system-information-using-the-terminal/