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Pass variables to Ruby script via command line
... variables and have only logical true/false values.
You can access values from environment variables:
> FIRST_NAME='Andy Warhol' ruby -e 'puts ENV["FIRST_NAME"]'
> Andy Warhol
Drawbacks are present here to, you have to set all the variables before the script invocation (only for your ruby ...
Why doesn't String switch statement support a null case?
...throws NullPointerException ? See the commented line below (example taken from the Java Tutorials article on switch ):
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How does node.bcrypt.js compare hashed and plaintext passwords without the salt?
From github :
3 Answers
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How do I switch between the header and implementation file in Xcode 4?
...ng, instead of hitting the same key binding 3 times in a row to cycle back from file 2 to file 1.
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What does gcc's ffast-math actually do?
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@Andrey: For this example, you go from 7 multiplies down to 3.
– Mysticial
Sep 14 '11 at 17:55
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Linux equivalent of the Mac OS X “open” command [closed]
I've found the "open" command in Mac OS X very handy in the command line. From "man open":
7 Answers
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New self vs. new static
...u called the method on.
In the following example, B inherits both methods from A. The self invocation is bound to A because it's defined in A's implementation of the first method, whereas static is bound to the called class (also see get_called_class()).
class A {
public static function get_se...
Difference between attr_accessor and attr_accessible
...ils, what is the difference between attr_accessor and attr_accessible ? From my understanding, using attr_accessor is used to create getter and setter methods for that variable, so that we can access the variable like Object.variable or Object.variable = some_value .
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Echo a blank (empty) line to the console from a Windows batch file [duplicate]
When outputting status messages to the console from a Windows batch file, I want to output blank lines to break up the output. How do I do this?
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Detect 7 inch and 10 inch tablet programmatically
...ayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
From this, we can get the information required to size the display:
int widthPixels = metrics.widthPixels;
int heightPixels = metrics.heightPixels;
This will return the absolute value of the width and the height in pixels,...