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How to temporarily exit Vim and go back
... Can use $ ps to find whether we're in a vim sub-shell before calling $ exit to avoid closing the terminal accidentally. Found this here (I haven't tried the prompt indicator mentioned on the website).
– Daniel
May 2 '19 at 10:07
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Make $JAVA_HOME easily changable in Ubuntu [closed]
In Ubuntu, I'd like to switch my JAVA_HOME environment variable back and forth between Java 5 and 6.
8 Answers
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Scala: join an iterable of strings
...,"): String = list match { case head :: tail => tail.foldLeft(head)(_ + delim + _) case Nil => "" }
– Davos
Jul 11 '17 at 14:37
2
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CSS: Change image src on img:hover
... <img src="https://cdn4.iconfinder.com/data/icons/imoticons/105/imoticon_15-128.png" />
<img src="https://cdn4.iconfinder.com/data/icons/imoticons/105/imoticon_12-128.png" />
</a>
CSS
a img:last-child {
display: none;
}
a:hover img:last-child {
display: block;
}
a:ho...
how to make svn diff show only non-whitespace line changes between two revisions
... can use
svn diff -r 100:200 -x -b > file.diff
If you want to ignore all whitespaces:
svn diff -x -w | less
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Malloc vs new — different padding
...or high-performance computing (10^5 - 10^6 cores). The code is intended to allow for communications between (potentially) different machines on different architectures. He's written a comment that says something along the lines of:
...
Algorithm to detect intersection of two rectangles?
... if you can find a line that separates the two objects. e.g. the objects / all points of an object are on different sides of the line.
The fun thing is, that it's sufficient to just check all edges of the two rectangles. If the rectangles don't overlap one of the edges will be the separating axis....
How can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?
...
You are so close! All you need to do is select BOTH the home and its max date time, then join back to the topten table on BOTH fields:
SELECT tt.*
FROM topten tt
INNER JOIN
(SELECT home, MAX(datetime) AS MaxDateTime
FROM topten
GR...
How to detect if a variable is an array
...ng() (this is guaranteed to work by ECMA-262):
Object.prototype.toString.call(obj) === '[object Array]'
Both methods will only work for actual arrays and not array-like objects like the arguments object or node lists. As all array-like objects must have a numeric length property, I'd check for th...
How do I install jmeter on a Mac?
...
The easiest way to install it is using Homebrew:
brew install jmeter
Or if you need plugins also:
brew install jmeter --with-plugins
And to open it, use the following command (since it doesn't appear in your Applications):
open /usr/local/bi...