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What is the difference between PS1 and PROMPT_COMMAND
...he terminal. Note the outer ' surrounding the entire PROMPT_COMMAND expression. It includes PS1 so that this variable is re-evaluated each time the PROMPT_COMMAND variable is evaluated.
PROMPT_COMMAND='RET=$?;\
BRANCH="";\
ERRMSG="";\
if [[ $RET != 0 ]]; then\
ERRMSG=" $RET";\
fi;\
if...
How to save a BufferedImage as a File
...
File outputfile = new File("image.jpg");
ImageIO.write(bufferedImage, "jpg", outputfile);
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How do I provide JVM arguments to VisualVM?
...DK_HOME%\lib\visualvm\etc\visualvm.conf
Xms and Xmx are in the default_options line.
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d3 axis labeling
... simply by adding an SVG text element. A good example of this is my recreation of Gapminder’s animated bubble chart, The Wealth & Health of Nations. The x-axis label looks like this:
svg.append("text")
.attr("class", "x label")
.attr("text-anchor", "end")
.attr("x", width)
.at...
Embedding SVG into ReactJS
...er support for SVG (source). You just need to apply some syntax transformations to make it JSX compatible, like you already have to do for HTML (class → className, style="color: purple" → style={{color: 'purple'}}). For any namespaced (colon-separated) attribute, e.g. xlink:href, remove the : an...
Why does std::getline() skip input after a formatted extraction?
...o do with the input you provided yourself but rather with the default behavior std::getline() exhibits. When you provided your input for the name (std::cin >> name), you not only submitted the following characters, but also an implicit newline was appended to the stream:
"John\n"
A newline ...
How to make a HTML Page in A4 paper size page(s)?
...art.com/article/boom
Here's an excerpt of that article:
CSS2 has a notion of paged media (think sheets of paper), as opposed to continuous media (think scrollbars). Style sheets can set the size of pages and their margins. Page templates can be given names and elements can state which named pag...
how to File.listFiles in alphabetical order?
...ut::println)
Again, replace the printing with whichever processing operation you would like.
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Express-js wildcard routing to cover everything under and including a path
...er/lib/middleware/router.js
If you have 2 routes that perform the same action you can do the following to keep it DRY.
var express = require("express"),
app = express.createServer();
function fooRoute(req, res, next) {
res.end("Foo Route\n");
}
app.get("/foo*", fooRoute);
app.get("/foo", f...
How can I install from a git subdirectory with pip?
... the following:
pip install -e git+https://git.repo/some_repo.git#egg=version_subpkg&subdirectory=repo # install a python package from a repo subdirectory
We probably have to wait for a while until it gets merged to master and is distributed.
UPDATE: This is now available and documented at h...