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What is the $? (dollar question mark) variable in shell scripting? [duplicate]
...t executed command.
Try the following in the shell:
ls somefile
echo $?
If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default "success" return value). If it doesn't exist, you should get a number other...
Is embedding background image data into CSS as Base64 good or bad practice?
... you want your images and style information to be cached separately. Also if you encode a large image or a significant number of images in to your css file it will take the browser longer to download the file leaving your site without any of the style information until the download completes. For ...
Google maps API V3 - multiple markers on exact same spot
... on the same spot, only some which are very close together.
But a real life example with markers on the exact same spot can be seen on http://www.ejw.de/ejw-vor-ort/ (scroll down for the map and click on a few markers to see the spider-effect).
That seems to be the perfect solution for your prob...
Should I avoid the use of set(Preferred|Maximum|Minimum)Size methods in Java Swing?
... those methods? (I can only think adding portability between systems with different screen resolution.)
Some (incomplete, and unfortunately the links are broken due to migration of SwingLabs to java.net) technical reasons are for instance mentioned in the Rules (hehe) or in the link @bendicott fou...
how to use sed, awk, or gawk to print only what is matched?
...add use -E sed option to trigger modern RE format. Check re_format(7), specifically last paragraph of DESCRIPTION developer.apple.com/library/mac/#documentation/Darwin/Reference/…
– anddam
Mar 3 '13 at 16:33
...
MongoDB relationships: embed or reference?
... not so much a "storage space" issue as it is a "data consistency" issue. If many records will refer to the same data it is more efficient and less error prone to update a single record and keep references to it in other places.
Document size considerations
MongoDB imposes a 4MB (16MB with 1.8) si...
Git: “Not currently on any branch.” Is there an easy way to get back on a branch, while keeping the
...
If you have not committed:
git stash
git checkout some-branch
git stash pop
If you have committed and have not changed anything since:
git log --oneline -n1 # this will give you the SHA
git checkout some-branch
git merge ...
Disable a Button
...
The boolean value for NO in Swift is false.
button.isEnabled = false
should do it.
Here is the Swift documentation for UIControl's isEnabled property.
share
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How can I specify a local gem in my Gemfile?
...
Something to watch out for might be Spring. If you are using a local path for your gem you could notice cached versions of your local gem like I did in rails console. If it doesn't seem like your local gem changes are being picked up try spring stop to see if it is i...
How do I loop through or enumerate a JavaScript object?
...
"p2": "value2",
"p3": "value3"
};
for (var key in p) {
if (p.hasOwnProperty(key)) {
console.log(key + " -> " + p[key]);
}
}
For-of with Object.keys() alternative:
var p = {
0: "value1",
"b": "value2",
key: "value3"
};
for (var key ...