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How to check if running as root in a bash script
I'm writing a script that requires root level permissions, and I want to make it so that if the script is not run as root, it simply echoes "Please run as root." and exits.
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Where is array's length property defined?
We can determine the length of an ArrayList<E> using its public method size() , like
7 Answers
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Explanation of JSONB introduced by PostgreSQL
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First, hstore is a contrib module, which only allows you to store key => value pairs, where keys and values can only be texts (however values can be sql NULLs too).
Both json & jsonb allows you to store a valid JSON value (defined ...
How do you make a web application in Clojure? [closed]
I suppose this is a strange question to the huge majority of programmers that work daily with Java. I don't. I know Java-the-language, because I worked on Java projects, but not Java-the-world. I never made a web app from scratch in Java. If I have to do it with Python, Ruby, I know where to go (Dja...
How fast is D compared to C++?
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To enable all optimizations and disable all safety checks, compile your D program with the following DMD flags:
-O -inline -release -noboundscheck
EDIT: I've tried your programs with g++, dmd and gdc. dmd does lag behind, but gdc achieves performance very...
Why is Java's Iterator not an Iterable?
...ts elements - and there's no need to iterate over a single instance, which is what an iterator represents.
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python generator “send” function purpose?
...ple of why the "send" function associated with Python generator function exists? I fully understand the yield function. However, the send function is confusing to me. The documentation on this method is convoluted:
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Is using Random and OrderBy a good shuffle algorithm?
...hms over at Coding Horror . I have seen that somewhere people have done this to shuffle a list:
12 Answers
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When to prefer JSON over XML?
My requirement is just to display a set of values retrieved from database on a spread. I am using jquery.
18 Answers
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Wait until file is unlocked in .NET
...s the simplest way of blocking a thread until a file has been unlocked and is accessible for reading and renaming? For example, is there a WaitOnFile() somewhere in the .NET Framework?
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