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How to find Unused Amazon EC2 Security groups
... @Erik Yes, I only have a single region and the AWS scripts have their home region set via environmental variables. I'd be interested in seeing a multi-region version of this script.
– Ray
Apr 15 '15 at 21:28
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Checking if a double (or float) is NaN in C++
...is, for a float f, f != f will be true only if f is NaN.
Note that, as some comments below have pointed out, not all compilers respect this when optimizing code.
For any compiler which claims to use IEEE floating point, this trick should work. But I can't guarantee that it will work in practice....
What are some uses of template template parameters?
I've seen some examples of C++ using template template parameters (that is templates which take templates as parameters) to do policy-based class design. What other uses does this technique have?
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Difference between / and /* in servlet mapping url pattern
...iltin default servlet is also capable of dealing with HTTP cache requests, media (audio/video) streaming and file download resumes. Usually, you don't want to override the default servlet as you would otherwise have to take care of all its tasks, which is not exactly trivial (JSF utility library Omn...
Hide/Show Column in an HTML Table
I have an HTML table with several columns and I need to implement a column chooser using jquery. When a user clicks on a checkbox I want to hide/show the corresponding column in the table. I would like to do this without attaching a class to every td in the table, is there a way to select an entir...
How to calculate time elapsed in bash script?
I print the start and end time using date +"%T" , which results in something like:
20 Answers
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Setting default permissions for newly created files and sub-directories under a directory in Linux?
...ou can set the group setuid bit on the directory with
chmod g+rwxs dirname
This will ensure that files created in the directory are owned by the group. You should then make sure everyone runs with umask 002 or 007 or something of that nature---this is why Debian and many other linux systems ar...
What does passport.session() middleware do?
...) into the true deserialized user object.
Whilst the other answers make some good points I thought that some more specific detail could be provided.
app.use(passport.session());
is equivalent to
app.use(passport.authenticate('session'));
Where 'session' refers to the following strategy that ...
What are enums and why are they useful?
Today I was browsing through some questions on this site and I found a mention of an enum being used in singleton pattern about purported thread safety benefits to such solution.
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Check if an element's content is overflowing?
What's the easiest way to detect if an element has been overflowed?
14 Answers
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