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What is the proper way to test if a parameter is empty in a batch file?
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Yes, I actually tried this approach and from what I could tell this only works with ENVIRONMENT variables. Therefore, didn't work with %1 or a variable defined inside the batch file.
– blak3r
Mar 31 '10 at 14:23
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What does the line “#!/bin/sh” mean in a UNIX shell script?
...nd that a line starting with # is a comment, and will ignore the !/usr/bin/whatever portion, which might otherwise be a syntax error in that particular language.
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What are copy elision and return value optimization?
What is copy elision? What is (named) return value optimization? What do they imply?
4 Answers
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What does numpy.random.seed(0) do?
What does np.random.seed do in the below code from a Scikit-Learn tutorial? I'm not very familiar with NumPy's random state generator stuff, so I'd really appreciate a layman's terms explanation of this.
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What is the syntax for “not equal” in SQLite?
I want to return the cursor that points anything that are NOT onSale, what should I change? Thanks!
3 Answers
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How to tell which version of a gem a rails app is using
...Rails 3 and Rails 4, use bundle show
In Rails 2, rake gems will print out what gems, dependencies, and versions are installed, frozen, etc.
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Difference between 'new operator' and 'operator new'?
What is difference between "new operator" and "operator new"?
8 Answers
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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...r flag or pragma). Generally, the assumption is that the programmer wrote what she did for a reason, and the compiler should respect that. If you want (a*a*a)*(a*a*a), write that.
That can be a pain to write, though; why can't the compiler just do [what you consider to be] the right thing when yo...
T-SQL: Using a CASE in an UPDATE statement to update certain columns depending on a condition
...then this could cause concurrency issues.
The only way to do specifically what you're asking is to use dynamic SQL. This is, however, something I'd encourage you to stay away from. The solution above will almost certainly be sufficient for what you're after.
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How do I get a Date without time in Java?
...Your code will be much clearer if you're able to use types which represent what you're actually trying to do.
There are many, many other reasons to use Joda Time or java.time instead of the built-in java.util types - they're generally far better APIs. You can always convert to/from a java.util.Date...