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How to change a command line argument in Bash?
Is there a way to change the command line arguments in a Bash script. Say for example, a Bash script is invoked the following way:
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Ruby Metaprogramming: dynamic instance variable names
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The method you are looking for is instance_variable_set. So:
hash.each { |name, value| instance_variable_set(name, value) }
Or, more briefly,
hash.each &method(:instance_variable_set)
If your instance variable names are missing ...
Select last N rows from MySQL
I want to select last 50 rows from MySQL database within column named id which is primary key . Goal is that the rows should be sorted by id in ASC order, that’s why this query isn’t working
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How to disable google translate from html in chrome
I just made a website for a french restaurant. The website is in english, but I guess there is enough french on the website (labeled pictures of menu items) to prompt the visitor to translate the website if using Chrome.
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npm failed to install time with make not found error
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Which OS are you using?
If it's Ubuntu you'll need to install the build-essential package:
$ sudo apt-get install build-essential
Then try to install the package again.
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What is the difference between svg's x and dx attribute?
What is the difference between svg's x and dx attribute (or y and dy)? When would be a proper time to use the axis shift attribute (dx) versus the location attribute (x)?
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How do you create optional arguments in php?
In the PHP manual, to show the syntax for functions with optional parameters, they use brackets around each set of dependent optional parameter. For example, for the date() function, the manual reads:
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Create a menu Bar in WPF?
I want to create a menu bar identical to the one in windows forms in my WPF application.
4 Answers
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Rails 4: before_filter vs. before_action
In rails >4.0.0 generators creates CRUD operations with before_action not before_filter . It seems to do the same thing. So what's the difference between these two?
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Passing a list of kwargs?
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Yes. You do it like this:
def method(**kwargs):
print kwargs
keywords = {'keyword1': 'foo', 'keyword2': 'bar'}
method(keyword1='foo', keyword2='bar')
method(**keywords)
Running this in Python confirms these produce identical r...