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Catching error codes in a shell pipe
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If you really don't want the second command to proceed until the first is known to be successful, then you probably need to use temporary files. The simple version of that is:
tmp=${TMPDIR:-/tmp}/mine.$$
if ./a > $tmp.1
then
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How to remove all MySQL tables from the command-line without DROP database permissions? [duplicate]
How do I drop all tables in Windows MySQL, using command prompt? The reason I want to do this is that our user has access to the database drops, but no access to re-creating the database itself, for this reason we must drop the tables manually. Is there a way to drop all the tables at once? Bear in ...
Which HTML5 reset CSS do you use and why? [closed]
...of a reset sheet. It's making too many assumptions.
BluePrint Reset:(literally a blueprint)
body {
line-height: 1.5;
background: white;
}
Whats up with 1.5. And why background white?(I know it's for correcting but still not necessary)
Normalize.css: (Not normal)
https://github.com/necol...
Making Maven run all tests, even when some fail
I have a project with several modules. When all tests pass, Maven test runs them all.
5 Answers
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How to create a tag with Javascript?
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FYI, document.head is supported in all major browsers.
– Rob W
Feb 23 '12 at 18:12
30
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How to drop rows of Pandas DataFrame whose value in a certain column is NaN
...ta, including dropna(), is built into pandas explicitly. Aside from potentially improved performance over doing it manually, these functions also come with a variety of options which may be useful.
In [24]: df = pd.DataFrame(np.random.randn(10,3))
In [25]: df.iloc[::2,0] = np.nan; df.iloc[::4,1] ...
What's the difference between tilde(~) and caret(^) in package.json?
After I upgraded to latest stable node and npm , I tried npm install moment --save . It saves the entry in the package.json with the caret ^ prefix. Previously, it was a tilde ~ prefix.
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Why are elementwise additions much faster in separate loops than in a combined loop?
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Upon further analysis of this, I believe this is (at least partially) caused by the data alignment of the four-pointers. This will cause some level of cache bank/way conflicts.
If I've guessed correctly on how you are allocating your arrays, they are likely to be aligned to the page line....
Why is null an object and what's the difference between null and undefined?
...nown what the value is.
One thing to remember is that null is not, conceptually, the same as false or "" or such, even if they equate after type casting, i.e.
name = false;
You: What is name?
JavaScript: Boolean false.
name = '';
You: What is name?
JavaScript: Empty string
*: name in this context...
List all of the possible goals in Maven 2?
...d of the following phases:
validate: validate the project is correct and all necessary information is available.
compile: compile the source code of the project.
test: test the compiled source code using a suitable unit testing framework. These tests should not require the code be packaged or depl...