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Implements vs extends: When to use? What's the difference?
... void main(String args[]){
Dog dog = new Dog("Tiger",16);
Cat cat = new Cat("July",20);
System.out.println("Dog:"+dog);
System.out.println("Cat:"+cat);
dog.remember();
dog.protectOwner();
Learn dl = dog;
dl.learn();
cat.reme...
How to cat a file containing code?
I want to print code into a file using cat <<EOF >> :
4 Answers
4
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How do I convert an array object to a string in PowerShell?
...
$a = 'This', 'Is', 'a', 'cat'
Using double quotes (and optionally use the separator $ofs)
# This Is a cat
"$a"
# This-Is-a-cat
$ofs = '-' # after this all casts work this way until $ofs changes!
"$a"
Using operator join
# This-Is-a-cat
$a -joi...
Print string and variable contents on the same line in R
... can use paste with print
print(paste0("Current working dir: ", wd))
or cat
cat("Current working dir: ", wd)
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proper way to sudo over ssh
...-t user@server "sudo script"
See man ssh:
-t Force pseudo-tty allocation. This can be used to execute arbi-
trary screen-based programs on a remote machine, which can be
very useful, e.g., when implementing menu services. Multiple -t
options force tty allocation...
How to append one file to another in Linux from the shell?
...
Use bash builtin redirection (tldp):
cat file2 >> file1
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Have nginx access_log and error_log log to STDOUT and STDERR of master process
...
In docker image of PHP-FPM, i've see such approach:
# cat /usr/local/etc/php-fpm.d/docker.conf
[global]
error_log = /proc/self/fd/2
[www]
; if we send this to /proc/self/fd/1, it never appears
access.log = /proc/self/fd/2
...
Why do we need virtual functions in C++?
... void eat() { std::cout << "I'm eating generic food."; }
};
class Cat : public Animal
{
public:
void eat() { std::cout << "I'm eating a rat."; }
};
In your main function:
Animal *animal = new Animal;
Cat *cat = new Cat;
animal->eat(); // Outputs: "I'm eating generic...
Replace multiple strings with multiple other strings
...tiple words in a string with multiple other words. The string is "I have a cat, a dog, and a goat."
18 Answers
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Making an iframe responsive
... site http://css-tricks.com/NetMag/FluidWidthVideo/Article-FluidWidthVideo.php.
Its very useful and easy to understand. All you need to create
<div class="videoWrapper">
<!-- Copy & Pasted from YouTube -->
<iframe width="560" height="349" src="http://www.youtube.com/embe...