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how perform grep operation on all files in a directory
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grep $PATTERN * would be sufficient. By default, grep would skip all subdirectories. However, if you want to grep through them, grep -r $PATTERN * is the case.
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Why are hexadecimal numbers prefixed with 0x?
...an immediately tell the base (0 is the same in both bases),
it's mathematically sane (00005 == 05), and
no precious special characters are needed (as in #123).
When C was created from B, the need for hexadecimal numbers arose (the PDP-11 had 16-bit words) and all of the points above were still val...
Get the subdomain from a URL
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Anyone have any great ideas besides
storing a list of all TLDs?
No, because each TLD differs on what counts as a subdomain, second level domain, etc.
Keep in mind that there are top level domains, second level domains, and subdomains. Technically speaking, everything except ...
Why can a function modify some arguments as perceived by the caller, but not others?
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Some answers contain the word "copy" in a context of a function call. I find it confusing.
Python doesn't copy objects you pass during a function call ever.
Function parameters are names. When you call a function Python binds these parameters to whatever objects you pass (via names in a ...
How do I put a clear button inside my HTML text input box like the iPhone does?
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@thebluefox has summarized the most of all. You're only also forced to use JavaScript to make that button to work anyway. Here's an SSCCE, you can copy'n'paste'n'run it:
<!DOCTYPE html>
<html lang="en">
<head>
<title>SO questio...
Reverse of JSON.stringify?
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JSON.stringify and JSON.parse are almost oposites, and "usually" this kind of thing will work:
var obj = ...;
var json = JSON.stringify(obj);
var obj2 = JSON.parse(json);
so that obj and obj2 are "the same".
However there are some limitations to be aware of.
Often these issues ...
Overriding Binding in Guice
...er be injecting mock or fake objects by hand.
On the other hand, if you really want to replace a single binding, you could use Modules.override(..):
public class ProductionModule implements Module {
public void configure(Binder binder) {
binder.bind(InterfaceA.class).to(ConcreteA.class...
Serializing an object as UTF-8 XML in .NET
...o a string again, so its no longer in UTF-8, but back in UTF-16 (though ideally its best to consider strings at a higher level than any encoding, except when forced to do so).
To get the actual UTF-8 octets you could use:
var serializer = new XmlSerializer(typeof(SomeSerializableObject));
var mem...
What do the crossed style properties in Google Chrome devtools mean?
... a style exists in an matching rule but is commented out, or if you've manually disabled it by unchecking it within the Chrome developer tools. It will also show as crossed out, but with an error icon, if the style has a syntax error.)
For example, if a background color was applied to all divs, but...
Is char signed or unsigned by default?
... is 100% equivalent to declaring it as signed int. This is always true for all compilers and architectures.
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