大约有 3,300 项符合查询结果（耗时：0.0171秒） [XML]
Which characters need to be escaped when using Bash?
... in a format that can be reused as shell input.
Some samples:
read foo
Hello world
printf "%q\n" "$foo"
Hello\ world
printf "%q\n" $'Hello world!\n'
$'Hello world!\n'
This could be used through variables too:
printf -v var "%q" "$foo
"
echo "$var"
$'Hello world\n'
Quick check with all (128) a...
How to check whether a string contains a substring in Ruby
...
You can also do this...
my_string = "Hello world"
if my_string["Hello"]
puts 'It has "Hello"'
else
puts 'No "Hello" found'
end
# => 'It has "Hello"'
This example uses Ruby's String #[] method.
...
method overloading vs optional parameter in C# 4.0 [duplicate]
...ethod foo to be be called/used like so, foo(), foo(1), foo(1,2), foo(1,2, "hello"). With method overloading you would implement the solution like this,
///Base foo method
public void DoFoo(int a, long b, string c)
{
//Do something
}
/// Foo with 2 params only
public void DoFoo(int a, long b)
...
Explanation of …
...
Hello from the future. <template> is here, but sites are still using this technique, such as reddit.com. :F
– Victor Zamanian
Mar 28 '17 at 18:22
...
sys.argv[1] meaning in script
...line argument passed to your script.
For example, if your script is named hello.py and you issue:
$ python3.1 hello.py foo
or:
$ chmod +x hello.py # make script executable
$ ./hello.py foo
Your script will print:
Hello there foo
...
Align contents inside a div
...s everywhere except IE5.x.
<div style="width: 50%; margin: 0 auto;">Hello</div>
For this to work in IE6, you need to make sure Standards Mode is on by using a suitable DOCTYPE.
If you really need to support IE5/Quirks Mode, which these days you shouldn't really, it is possible to com...
How do I get a PHP class constructor to call its parent's parent's constructor?
...tion __construct()
{
echo 'Grandpa<br/>';
Kiddo::hello();
}
}
class Papa extends Grandpa
{
public function __construct()
{
echo 'Papa<br/>';
parent::__construct();
}
}
class Kiddo extends Papa
{
public function __construct()
...
Changing specific text's color using NSMutableAttributedString in Swift
...ex of the coloured-to-be characters in the string e.g.
var main_string = "Hello World"
var string_to_color = "World"
var range = (main_string as NSString).rangeOfString(string_to_color)
Then you convert to attributed string and use 'add attribute' with NSForegroundColorAttributeName:
var attrib...
Is it possible to declare two variables of different types in a for loop?
...e for more than two objects.
for (auto p = std::make_pair(5, std::string("Hello World")); p.first < 10; ++p.first) {
std::cout << p.second << std::endl;
}
std::make_pair will return the two arguments in a std::pair. The elements can be accessed with .first and .second.
For mo...
PhpStorm wrap/surround selection?
...hat select a word and type single quote (or double quote) to surround it.
Hello World
'Hello World'
"Hello World"
To enable this, tick on checkbox of Preferences -> IDE -> Editor -> Smart Keys -> Surround Selection on typing quote or brace.
Another way, you select something (word, c...