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                    require 'enumerator'

ary = [ 1, 2, 3, 4 ]

# iterate over two elements at a time
ary.each_slice(2) { |a,b| p [a, b] }

# iterate over every pair of consecutive pair of numbers
ary.each_cons(2) { |a, b| p [a, b] }

# An Enumerable::Enumerator object can be created as well,
# that mixes in Enumerable, for further processing:
ary.enum_for(:each_cons, 2).map { |a,b| a + b  } # => [3, 5, 7]
function get_os_($user_agent)
	$oses = array (
		'Windows 3.11' => 'Win16',
		'Windows 95' => '(Windows 95)|(Win95)|(Windows_95)',
		'Windows 98' => '(Windows 98)|(Win98)',
		'Windows 2000' => '(Windows NT 5.0)|(Windows 2000)',
		'Windows XP' => '(Windows NT 5.1)|(Windows XP)',
		'Windows 2003' => '(Windows NT 5.2)',
		'Windows NT 4.0' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
		'Windows ME' => 'Windows ME',
		'Open BSD'=>'OpenBSD',
		'Sun OS'=>'SunOS',
		'Search Bot'=>'(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp/cat)|(msnbot)|(ia_archiver)'

	foreach($oses as $os=>$pattern)
		if (eregi($pattern, $user_agent))
			return $os;
	return 'Unknown';

For using:
print get_os_($_SERVER['HTTP_USER_AGENT']);
                    This function determines visitor browser.

function get_browser_($user_agent)
	$browsers = array(
		'Opera' => 'Opera',
		'Mozilla Firefox'=> '(Firebird)|(Firefox)',
		'Galeon' => 'Galeon',
		'Lynx' => 'Lynx',
		'Netscape' => '(Mozilla/4\.75)|(Netscape6)|(Mozilla/4\.08)|(Mozilla/4\.5)|(Mozilla/4\.6)|(Mozilla/4\.79)',
		'SearchBot' => '(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp/cat)|(msnbot)|(ia_archiver)',
		'Internet Explorer 6' => '(MSIE 6\.[0-9]+)',
		'Internet Explorer 5' => '(MSIE 5\.[0-9]+)',
		'Internet Explorer 4' => '(MSIE 4\.[0-9]+)',

	foreach($browsers as $browser=>$pattern)
		if (eregi($pattern, $user_agent))
			return $browser;
	return 'Unknown';

For using:
echo get_browser_($_SERVER['HTTP_USER_AGENT']);
                    was getting this error on certain files until I added this to ~/.bash_profile :
export LC_CTYPE="en_US.UTF-8"
export LANG="en_US.UTF-8"
                    Include this to convert those ampersands and angle brackets to proper entities. It can help with XML too but remember there are lots of other entities that need converting. 

use HTML::Entities;


$html = encode_entities($string, '<>&"');

cf pour les explications
(et reste à valider la clé de contrôle)                
                    The "cvs status" command is practically useless, given the amount of stuff it spews out. So I do the following to find out the status of my local working copy. This shows all updated, added, or deleted files, as well as those CVS know nothing about (and which perhaps should be added):

cvs status 2>&1 | egrep "(^\? |Status: )" | grep -v Up-to-date
                    A neat trick in iTunes 4.5 that changes the little arrows next to each artist/album/title to search your library for that string instead of the iTunes Music Store.

defaults write invertStoreLinks -bool YES
                    Sometimes you want to log generated SQL selectively, so popping -DEOAdaptorDebugEnabled=true on the command line of your app is verbose overkill. Here's how you can selectively enable and disable SQL logging:

// Do something that roundtrips the DB, like editingContext.saveChanges().
(new DOMConfigurator()).doConfigure(resourceManager().inputStreamForResourceNamed("log4j.xml", "app", null), LogManager.getLoggerRepository());