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bash assign default value
...stead of the longer LONG_VARIABLE_NAME=${LONG_VARIABLE_NAME:-hello} , but now bash also tries to execute 'hello' and that gives a command not found. Any way to avoid that? Or will I have to stick to the latter? Can someone give an example where the assign default is actually useful?
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How to add local jar files to a Maven project?
...rflow user - I am pretty sure I've seen a similar answer here before - but now I cannot find it.
The best option for having local JAR files as a dependency is to create a local Maven repository. Such a repository is nothing more than a proper directory structure with pom files in it.
For my exam...
Warning the user/local/mysql/data directory is not owned by the mysql user
I can't start the mysql service in Snow Leopard, and in the panel prefs appears the message,
2 Answers
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Argparse: Required argument 'y' if 'x' is present
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How about using parser.parse_known_args() method and then adding the --lport and --rport args as required args if --prox is present.
# just add --prox arg now
non_int = argparse.ArgumentParser(description="stackoverflow question",
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Why doesn't Java Map extend Collection?
...ven key
maps to, nor can you delete the entry
for a given key without knowing what
value it maps to.
Collection could be made to extend
Map, but this raises the question:
what are the keys? There's no really
satisfactory answer, and forcing one
leads to an unnatural interface.
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Process escape sequences in a string in Python
...Adding a regular expression to solve the problem
(Surprisingly, we do not now have two problems.)
What we need to do is only apply the unicode_escape decoder to things that we are certain to be ASCII text. In particular, we can make sure only to apply it to valid Python escape sequences, which are...
Singleton pattern in nodejs - is it needed?
...ntly came across this article on how to write a singleton in Node.js. I know the documentation of require states that:
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What is the “reactor” in Maven?
...: My New Favourite Maven Plugin.
Most of the reactor plugin features are now natively supported (since Maven 2.1.0). See Maven Tips and Tricks: Advanced Reactor Options.
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Count(*) vs Count(1) - SQL Server
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now that you ask, I'm not sure. I thought for COUNT(*) to run, it needs a table, so the sub-query should act like one. Otherwise, I don't see a way for COUNT(*) to return a meaningful value
– asgs
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Is there a way to iterate over a dictionary?
I know NSDictionaries as something where you need a key in order to get a value . But how can I iterate over all keys and values in a NSDictionary , so that I know what keys there are, and what values there are? I know there is something called a for-in-loop in JavaScript . Is there som...