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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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What is the function __construct used for?
...o declare the constructor. You can also use the class name, for ex:
class Cat
{
function Cat()
{
echo 'meow';
}
}
and
class Cat
{
function __construct()
{
echo 'meow';
}
}
Are equivalent. They are called whenever a new instance of the class is created, i...
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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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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Concatenating multiple text files into a single file in Bash
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This appends the output to all.txt
cat *.txt >> all.txt
This overwrites all.txt
cat *.txt > all.txt
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What is the difference between up-casting and down-casting with respect to class variable
...ClassCastExceptions:
Animal animal = getAnimal(); // Maybe a Dog? Maybe a Cat? Maybe an Animal?
if (animal instanceof Dog) {
// Guaranteed to succeed, barring classloader shenanigans
Dog castedDog = (Dog) animal;
}
...