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sed: print only matching group
...uses the entire line to be replaced with the contents of the group
echo "foo bar <foo> bla 1 2 3.4" |
sed -n 's/.*\([0-9][0-9]*[\ \t][0-9.]*[ \t]*$\)/\1/p'
2 3.4
share
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improve this answ...
What is the purpose of a self executing function in javascript?
...example, as mentioned in a comment by Alexander:
(function() {
var foo = 3;
console.log(foo);
})();
console.log(foo);
This will first log 3 and then throw an error on the next console.log because foo is not defined.
...
What is the difference between association, aggregation and composition?
...
For two objects, Foo and Bar the relationships can be defined
Association - I have a relationship with an object. Foo uses Bar
public class Foo {
void Baz(Bar bar) {
}
};
Composition - I own an object and I am responsible for ...
Overload constructor for Scala's Case Classes?
...
Overloading constructors isn't special for case classes:
case class Foo(bar: Int, baz: Int) {
def this(bar: Int) = this(bar, 0)
}
new Foo(1, 2)
new Foo(1)
However, you may like to also overload the apply method in the companion object, which is called when you omit new.
object Foo {
d...
Simpler way to create dictionary of separate variables?
...e in text[begin:end].split(',')]
return dict(zip(text,expr))
bar=True
foo=False
print(make_dict(bar,foo))
# {'foo': False, 'bar': True}
Note that this hack is fragile:
make_dict(bar,
foo)
(calling make_dict on 2 lines) will not work.
Instead of trying to generate the dict out of...
How to get process ID of background process?
... need to save the PID of the background process at the time you start it:
foo &
FOO_PID=$!
# do other stuff
kill $FOO_PID
You cannot use job control, since that is an interactive feature and tied to a controlling terminal. A script will not necessarily have a terminal attached at all so job c...
Change all files and folders permissions of a directory to 644/755
...
Why (?) it is better tham chmod -R a=r,u+w,a+X /foo?
– Peter Krauss
Sep 10 '18 at 0:23
fail...
What is function overloading and overriding in php?
...using the magic method __call.
An example of overriding:
<?php
class Foo {
function myFoo() {
return "Foo";
}
}
class Bar extends Foo {
function myFoo() {
return "Bar";
}
}
$foo = new Foo;
$bar = new Bar;
echo($foo->myFoo()); //"Foo"
echo($bar->myFoo()); //"Bar"...
How to debug JavaScript / jQuery event bindings with Firebug or similar tools?
...uming at some point an event handler is attached to your element (eg): $('#foo').click(function() { console.log('clicked!') });
You inspect it like so:
jQuery 1.3.x
var clickEvents = $('#foo').data("events").click;
jQuery.each(clickEvents, function(key, value) {
console.log(value) // prints "f...
How do you implement a private setter when using an interface?
...
In interface you can define only getter for your property
interface IFoo
{
string Name { get; }
}
However, in your class you can extend it to have a private setter -
class Foo : IFoo
{
public string Name
{
get;
private set;
}
}
...