//lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in <code>gem_original_require': no such file to load -- zlib (LoadError)
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in </code>require'
	from //lib/ruby/site_ruby/1.8/rubygems/spec_fetcher.rb:1
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in <code>gem_original_require'
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in </code>require'
	from //lib/ruby/site_ruby/1.8/rubygems/commands/query_command.rb:3
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in <code>gem_original_require'
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in </code>require'
	from //lib/ruby/site_ruby/1.8/rubygems/commands/list_command.rb:2
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in <code>gem_original_require'
	from //lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in </code>require'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:167:in <code>load_and_instantiate'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:88:in </code>[]'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:144:in <code>find_command'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:131:in </code>process_args'
	from //lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:102:in <code>run'
	from //lib/ruby/site_ruby/1.8/rubygems/gem_runner.rb:58:in </code>run'
	from /bin/gem:21

To solve this issue, move to the zlib/ folder, it should be something like this /usr/src/ruby-1.8.6-pXXX/ext/zlib/

execute the extconf.rb :

root@xen1:/usr/src/ruby-1.8.6-p398/ext/zlib# ruby extconf.rb

If every things are ok, you should see:

checking for deflateReset() in -lz... yes
checking for zlib.h... yes
checking for kind of operating system... Unix
creating Makefile

compile and deploy zlib by runnning both commands:

sudo make 
sudo make install

Make sure gem command is woking:

gem list

You should see:

*** LOCAL GEMS ***

rm -rf <code>find  . -type d -name .svn</code>

[2010-10-23 19:31:02 - adb]Failed to get the adb version: Cannot run program "/usr/src/android-sdk-linux_x86/tools/adb": java.io.IOException: error=2, No such file or directory

After googling I found those useful steps to make it running properly:

1. install getlibs from http://frozenfox.freehostia.com/cappy/getlibs-all.deb

2. open terminal and go to your android folder and then platforms/android-1.6/tools

3. run this command from terminal getlibs aapt

Source: http://ubuntuforums.org/showthread.php?t=1317567

sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" 
sudo apt-get update 
sudo apt-get install sun-java6-jre sun-java6-jdk sun-java6-plugin sun-java6-fonts

Verify your java version:

java -version

Done

Warning: include_once(Net/SMTP.php) [function.include-once]: failed to open stream: No such file or directory in /usr/lib/php/Mail/smtp.php on line 348 
Warning: include_once() [function.include]: Failed opening 'Net/SMTP.php' for inclusion (include_path='.:/usr/lib/php') in /usr/lib/php/Mail/smtp.php on line 348 
Fatal error: Class 'Net_SMTP' not found in /usr/lib/php/Mail/smtp.php on line 349

Solution:
All you need is to install the missing pear package:

sudo pear install Net_SMTP

#!/bin/sh -e 
APP_PATH=/home/zooz.com/current 
JUGGERNAUT_CONFIG="$APP_PATH/juggernaut.yml" 
JUGGERNAUT_PID="$APP_PATH/tmp/pids/juggernaut.pid" 
JUGGERNAUT_LOG="$APP_PATH/log/juggernaut.log" 
RAILS_ENV=production 
case $1 in 
        start) 
                echo "Starting Juggernaut ..." 
                juggernaut -d -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
        ;; 
        stop) 
                echo "Stopping Juggernaut ..." 
                juggernaut -k * -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
        ;; 
        restart) 
                echo "Juggernaut restart ..." 
                echo "Stopping Juggernaut ..." 
                juggernaut -k * -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
                echo "Starting Juggernaut ..." 
                juggernaut -d -c $JUGGERNAUT_CONFIG --pid $JUGGERNAUT_PID --log $JUGGERNAUT_LOG 
        ;; 
esac

Linux File Structure

You may find it useful :

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

after typing :

mysql -u root

I don’t know why ? but I know how to solve it.
First of all let’s disable password authentication :
Stop your MySQL daemon:

/etc/init.d/mysql stop

or

/etc/init.d/mysqld stop

Then run the following command line in background :

mysqld_safe --skip-grant-tables &

Secondly run :

mysql -u root

Finally, In your MySQL command line prompt issue the following command:

USE mysql;
UPDATE user SET password=PASSWORD("my_password") WHERE user="root";
FLUSH PRIVILEGES;
EXIT

Password is now reset to my_password. So just restart your MySQL server using :

/etc/init.d/mysql restart

or

/etc/init.d/mysqld restart

and use your new password to authenticate :

mysql -u root -p

All that remains is to enter your password.

• to make it bold, simply use * * (asterisk) between the text that intended to be bold in font style : i.e. *marouan* is rendred as marouan.
• to make it italic, simply use _ _ (underscore) between the text that intended to be italic in font style: i.e. _marouan_ is rendred as marouan.
• to make it strikethrough, simply use – - (dash) between the text that intended to be strikethrough in font style: i.e. -marouan- is rendred as marouan.

This is a stupid post but if you are addicted to Google Talk, like me, you will have more fun with GTalk using those few styling tips.

pecl install pecl_http
downloading pecl_http-1.6.3.tgz ...
Starting to download pecl_http-1.6.3.tgz (173,005 bytes)
.....................done: 173,005 bytes
71 source files, building
running: phpize
sh: phpize: not found
ERROR: `phpize' failed

Solution :
Just install php5-dev package

apt-get install php5-dev

or php4-dev if you are running php 4.x

apt-get install php4-dev