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Using the RUN instruction in a Dockerfile with 'source' does not work
... Eh? If you source a script inside a shell that only exists for the command, it's not able to have a lasting effect on any future commands run, assuming that the sum total of its action is setting environment variables. So why would you use source at all, vs just bash /usr/local/bin/virtualenvwra...
What's the best way to check if a file exists in C?
...exists
} else {
// file doesn't exist
}
You can also use R_OK, W_OK, and X_OK in place of F_OK to check for read permission, write permission, and execute permission (respectively) rather than existence, and you can OR any of them together (i.e. check for both read and write permission using R...
abort, terminate or exit?
What's the difference between those three, and how shall I end program in case of exception which I can't handle properly?
...
cannot load such file — zlib even after using rvm pkg install zlib
I installed zlib package and ruby 1.9.3 using rvm, but whenever I try to install
gems it says
cannot load such file -- zlib
...
How to find out what group a given user has?
In Unix/Linux, how do you find out what group a given user is in via command line?
5 Answers
...
Benefit of using Parcelable instead of serializing object
As I understand, Bundle and Parcelable belongs to the way Android performs serialization in. It is used for example in passing data between activities. But I wonder, if there are any benefits in using Parcelable instead of classic serialization in case of saving state of my business objects to...
How can I do test setup using the testing package in Go
...outlined here in the Main section:
TestMain runs in the main goroutine and can do whatever setup and
teardown is necessary around a call to m.Run. It should then call
os.Exit with the result of m.Run
It took me some time to figure out that this means that if a test contains a function func...
Is it pythonic to import inside functions?
... new code to an existing file I'll usually do the import where it's needed and then if the code stays I'll make things more permanent by moving the import line to the top of the file.
One other point, I prefer to get an ImportError exception before any code is run -- as a sanity check, so that's an...
What is the native keyword in Java for?
... actual implementation doesn’t have to use JNI. Certain JRE methods are handled intrinsically by the JVM. In fact, it’s not even mandatory that the implementation is actually native code. It’s just “implemented in a language other than the Java programming language”.
–...
What is the correct way of using C++11's range-based for?
...lt;X> initialization ...]
Elements:
1 3 5 7 9
Without any spurious (and potentially expensive) copy constructor call.
So, when observing elements in a container (i.e., for read-only access),
the following syntax is fine for simple cheap-to-copy types, like int, double, etc.:
for (auto elem ...