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 Science Humor: |
This was a Golden Age, a time of high adventure, rich living, and hard
dying... but nobody thought so. This was a future of fortune and theft,
pillage and rapine, culture and vice... but nobody admitted it.
-- Alfred Bester, "The Stars My Destination"
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| Chuck Norris Humor: |
Chuck Norris doesn't mow his lawn, he stands outside and dares it to grow.
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| Flush the DNS cache in Mac OS X - |
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To flush the DNS cache, launch Terminal and type the following command:
dscacheutil -flushcache
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| Verify a SHA-1 checksum on Mac OS X - |
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To verify a SHA-1 checksum, launch Terminal and type the following command:
/usr/bin/openssl sha1 filename-to-test
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| Edit the hosts file in Mac OS X - |
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The hosts file is a text document that maps IP addresses to hostnames. It's similar to, but trumps, DNS. To edit the hosts file in Mac OS X, launch Terminal and type:
sudo vi /etc/hosts
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| Remove all .svn and dot-underscore files - |
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find . -name ".svn" -prune -o -name "._*" -exec rm -if {} \;
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| Show/hide hidden files in Mac OS X - |
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To show hidden system files and folders in Finder on Mac OS X, launch Terminal and type:
defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
If you want to hide the default hidden systems file and folders, replace TRUE with FALSE.
Source: http://www.mactricksandtips.com/2008/04/show-hidden-files.html
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| Avoid 'stack level too deep' in Ruby - |
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#!/usr/local/bin/ruby
##!/opt/local/bin/ruby1.9
# Update Ruby via MacPorts:
# port info ruby19
# sudo port install ruby19
# http://www.macports.org/install.php
# http://trac.macports.org/wiki/InstallingMacPorts
# See:
# - Tailin' Ruby, http://judofyr.net/posts/tailin-ruby.html
# - Re: Ruby and recursion (Ackermann benchmark), http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/145593
class Class
# Sweet stuff!
def tailcall_optimize( *methods )
methods.each do |meth|
org = instance_method( meth )
define_method( meth ) do |*args|
if Thread.current[ meth ]
throw( :recurse, args )
else
Thread.current[ meth ] = org.bind( self )
result = catch( :done ) do
loop do
args = catch( :recurse ) do
throw( :done, Thread.current[ meth ].call( *args ) )
end
end
end
Thread.current[ meth ] = nil
result
end
end
end
end
end
# tail-call optimization test
# example 1
class TCOTest
# tail-recursive factorial
def fact( n, acc = 1 )
if n <2 then acc else fact( n-1, n*acc ) end
end
# length of factorial
def fact_size( n )
fact( n ).size
rescue
$!
end
end
t = TCOTest.new
# normal method
puts t.fact_size( 10000 ) # =>stack level too deep
# enable tail-call optimization
class TCOTest
tailcall_optimize :fact
end
# tail-call optimized method
puts t.fact_size( 10000 ) # =>14808
# example 2
class TCOTest2
def addnum(i)
p i
addnum(i+1)
end
end
#TCOTest2.new.addnum 0 # stack level too deep (SystemStackError)
# enable tail-call optimization
class TCOTest2
tailcall_optimize :addnum
end
TCOTest2.new.addnum 0
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| Open the current Ruby on Rails directory in TextMate without tmp, log and cache - |
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ls -1 | egrep -vi "(log|tmp|cache)" | xargs mate
Instead of typing this everytime an alias would be handy. Put this
alias railsmate='ls -1 | egrep -vi "(log|tmp|cache)" | xargs mate'
~/.profileor wherever you put your aliases. |
| How to avoid the ubygems load error - |
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If you install Ruby &RubyGems from scratch (like described hereor here), beginning with:
sudo mv /usr/local/lib/ruby ~/Desktop
and at some point have to execute the command:
sudo /usr/local/bin/ruby setup.rb
... you may see an error message that says:
/usr/local/bin/ruby: no such file to load -- ubygems (LoadError)
This can be avoided by setting the RUBYLIB path variable to include the lib directory of the downloaded RubyGems version:
unset RUBYOPT
export GEM_HOME=/usr/local/lib/ruby/gems/1.8
export RUBYLIB=/usr/local/lib/ruby:/path/to/download/dir/rubygems-1.3.1/lib
sudo /usr/local/bin/ruby setup.rb
or
sudo mkdir -p /usr/local/lib/ruby/gems/1.8
sudo mkdir -p /usr/local/lib/ruby/site_ruby/1.8
unset RUBYOPT
export GEM_HOME=/usr/local/lib/ruby/gems/1.8
export RUBYLIB=/usr/local/lib/ruby:/usr/local/lib/ruby/site_ruby/1.8
sudo cp -R -p /path/to/download/dir/rubygems-1.3.1/lib/* /usr/local/lib/ruby/site_ruby/1.8
sudo /usr/local/bin/ruby setup.rb
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| Capture iSight (Macbook) Video with Objective-C QTKit - |
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This is how we can capture video from Macbook iSight.
A Sample code from an IBAction button.
- (IBAction)startRecording:(id)sender
{
// Create a new Capture Session
mCaptureSession = [[QTCaptureSession alloc] init];
//Connect inputs and outputs to the session
BOOL success = NO;
NSError *error;
// Find a video device
QTCaptureDevice *device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
if(device) {
success = [device open:&error];
if(!success) {
// Handle Error!
}
// Add the video device to the session as device input
mCaptureDeviceInput = [[QTCaptureDeviceInput alloc] initWithDevice:device];
success = [mCaptureSession addInput:mCaptureDeviceInput error:&error];
if(!success) {
// Handle error
}
// Associate the capture view in the UI with the session
[mCaptureView setCaptureSession:mCaptureSession];
// Start the capture session runing
[mCaptureSession startRunning];
} // End if device
}
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| Compiling Apache2 under Mac OSX Leopard - |
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Insert the following commands into the console after you have downloaded and unziped the Apache2 package.
It will configure and install.
sudo ./configure --prefix=/usr/local/apache2 --enable-access --enable-actions --enable-alias --enable-asis --enable-auth --enable-auth_dbm --enable-auth_digest --enable-autoindex --enable-cache --enable-cgi --enable-dav --enable-dav_fs --enable-deflate --enable-dir --enable-disk_cache --enable-dumpio --enable-env --enable-expires --enable-fastcgi --enable-file_cache --enable-headers --enable-imap --enable-include --enable-info --enable-log_config --enable-log_forensic --enable-logio --enable-mem_cache --enable-mime --enable-mime_magic --enable-negotiation --enable-perl --enable-rewrite --enable-setenvif --enable-speling --enable-ssl --enable-status --enable-suexec --enable-unique_id --enable-userdir --enable-usertrack --enable-version --enable-vhost_alias --enable-so --enable-module=all --enable-shared=max
sudo make
sudo make install
Once All that is installed open your ~/.bash_profile and insert the following line to be first in your PATH environment variable.
export APACHE2="/usr/local/apache2/bin"
export PATH="${APACHE2}:${PATH}"
once that is complete. You can start your apache server with the following command:
sudo httpd -k start
sudo httpd -k stop
sudo httpd -k restart
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