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Semicolons superfluous at the end of a line in shell scripts?
... end of a line are superfluous, since the newline is also a command separator. case specifically needs double semicolons at the end of the last command in each pattern block; see help case for details.
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How far can memory leaks go?
I've run into memory leaks many times. Usually when I'm malloc -ing like there's no tomorrow, or dangling FILE * s like dirty laundry. I generally assume (read: hope desperately) that all memory is cleaned up at least when the program terminates. Are there any situations where leaked memory won't ...
Is it correct to use JavaScript Array.sort() method for shuffling?
...c as you say. In particular, I seem to remember that the standard library sorting from either Java or .NET (not sure which) can often detect if you end up with an inconsistent comparison between some elements (e.g. you first claim A < B and B < C, but then C < A).
It also ends up as a more ...
What kinds of patterns could I enforce on the code to make it easier to translate to another program
...ipulation (with language translation being a special case) since 1995, supported by a strong team of computer scientists. DMS provides generic parsing, AST building, symbol tables, control and data flow analysis, application of translation rules, regeneration of source text with comments, etc., all...
SQL Server NOLOCK and joins
Background: I have a performance-critical query I'd like to run and I don't care about dirty reads.
3 Answers
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Different results with Java's digest versus external utilities
...ten a simple Java class to generate the hash values of the Windows Calculator file. I am using Windows 7 Professional with SP1 . I have tried Java 6.0.29 and Java 7.0.03 . Can someone tell me why I am getting different hash values from Java versus (many!) external utilities and/or websites? ...
How does MongoDB sort records when no sort order is specified?
When we run a Mongo find() query without any sort order specified, what does the database internally use to sort the results?
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open read and close a file in 1 line of code
...lose it - Python will do it automatically either during garbage collection or at program exit. But as @delnan noted, it's better practice to explicitly close it for various reasons.
So, what you can do to keep it short, simple and explicit:
with open('pagehead.section.htm','r') as f:
output = ...
On design patterns: When should I use the singleton?
The glorified global variable - becomes a gloried global class. Some say breaking object-oriented design.
19 Answers
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What are the options for storing hierarchical data in a relational database? [closed]
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My favorite answer is as what the first sentence in this thread suggested. Use an Adjacency List to maintain the hierarchy and use Nested Sets to query the hierarchy.
The problem up until now has been that the coversion method fr...