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File content into unix variable with newlines
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Bash -ge 4 has the mapfile builtin to read lines from the standard input into an array variable.
help mapfile
mapfile < file.txt lines
printf "%s" "${lines[@]}"
mapfile -t < file.txt lines # strip trailing newlines
printf "%s\n" "${lines[@]}"
See also:
http...
Checking out Git tag leads to “detached HEAD state”
...t there is usually no problem with that state. You may create a new branch from the tag, if this makes you feel safer :)
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Dynamically Changing log4j log level
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Here you go: This is a snippet from the Controller where we use it. We have an admin page with some links to dynamically reconfigure logging, which then makes a GET to the link /admin/setLogLevel?level=Error and then we catch this in the controller lik...
What is monkey patching?
...de at runtime (typically at startup).
A simple example looks like this:
from SomeOtherProduct.SomeModule import SomeClass
def speak(self):
return "ook ook eee eee eee!"
SomeClass.speak = speak
Source: MonkeyPatch page on Zope wiki.
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How to suppress Pandas Future warning ?
...e time for this. And you probably don't either. Hopefully this saves you from falling down the rabbit hole or perhaps inspires someone to figure out how to truly suppress these messages!
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Is it safe to use -1 to set all bits to true?
...gn that int to the unsigned variable flags, you perform a value conversion from -2**31 (assuming a 32-bit int) to (-2**31 % 2**32) == 2**31, which is an integer with all bits but the first set to 1.
– David Stone
Dec 12 '12 at 1:53
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What's the best way to iterate over two or more containers simultaneously
...tation of zip is left as an exercise for the reader, but it follows easily from the implementation of indices.
(Before C++17 you’d have to write the following instead:)
for (auto items&& : zip(containerA, containerB))
get<0>(items) = get<1>(items);
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What's the difference between using INDEX vs KEY in MySQL?
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There's no difference. They are synonyms.
From the CREATE TABLE manual entry:
KEY is normally a synonym for INDEX. The key attribute PRIMARY KEY can
also be specified as just KEY when given in a column definition. This was
implemented for compatibility with o...
How to vertically align an image inside a div
...ative;
top: 50%;
transform: translateY(-50%);
This applies to anything.
From here.
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Rails I18n validation deprecation warning
...swer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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