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What's the difference between [ and [[ in Bash? [duplicate]
...and. It has several enhancements that make it a better choice if you write scripts that target bash. My favorites are:
It is a syntactical feature of the shell, so it has some special behavior that [ doesn't have. You no longer have to quote variables like mad because [[ handles empty strings and ...
Perl flags -pe, -pi, -p, -w, -d, -i, -t?
I have seen lots of ways of running Perl code or scripts, with different flags. However, when I try to google for what each flag means, I mainly get results to generic Perl sites and no specific information regarding the flags or their use is found there.
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ImportError: No module named matplotlib.pyplot
...c python and since it doesn't have matplotlib you should always start your script with the one installed with ports.
If python your_script.py works then change the #! to:
#!/usr/bin/env python
Or put the full path to the python interpreter that has the matplotlib installed in its library.
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When serving JavaScript files, is it better to use the application/javascript or application/x-javas
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text/javascript is obsolete
application/x-javascript was experimental while deciding to move to…
application/javascript is the current official MIME type for JS
That said, browsers often ignore the content-type sent by the server ...
Chrome can't load web worker
...
Chrome doesn't let you load web workers when running scripts from a local file.
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Sending emails with Javascript
...;button onclick="sendMail(); return false">Send</button>
The Javascript:
function sendMail() {
var link = "mailto:me@example.com"
+ "?cc=myCCaddress@example.com"
+ "&subject=" + encodeURIComponent("This is my subject")
+ "&body=" + encodeU...
How to change Rails 3 server default port in develoment?
... projects, and you will have a lot problems later...
In your project edit script/rails this way:
#!/usr/bin/env ruby
# This command will automatically be run when you run "rails" with Rails 3 gems installed from the root of your application.
APP_PATH = File.expand_path('../../config/application',...
How do I execute inserts and updates in an Alembic upgrade script?
...els and sessions as described below.
The following is an example migration script that sets up some declarative models that will be used to manipulate data in a session. The key points are:
Define the basic models you need, with the columns you'll need. You don't need every column, just the prima...
Selecting all text in HTML text input when clicked
...
You can use this javascript snippet:
<input onClick="this.select();" value="Sample Text" />
But apparently it doesn't work on mobile Safari. In those cases you can use:
<input onClick="this.setSelectionRange(0, this.value.length)" va...
How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
...w);
echo json_encode($_GET);
die ();
} //else
?><head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
var _settimer;
var _timer;
var _waiting;
$(function(){
clearTabl...