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How can I write a heredoc to a file in Bash script?
...se single quotes:
cat << 'EOF' > /tmp/yourfilehere
The variable $FOO will not be interpreted.
EOF
To pipe the heredoc through a command pipeline:
cat <<'EOF' | sed 's/a/b/'
foo
bar
baz
EOF
Output:
foo
bbr
bbz
... or to write the the heredoc to a file using sudo:
cat <<...
Syntax for a single-line Bash infinite while loop
...
while true; do foo; sleep 2; done
By the way, if you type it as a multiline (as you are showing) at the command prompt and then call the history with arrow up, you will get it on a single line, correctly punctuated.
$ while true
> do
...
How do JavaScript closures work?
...closure with the lexical environment of the execution context created when foo is invoked, closing over variable secret:
function foo() {
const secret = Math.trunc(Math.random()*100)
return function inner() {
console.log(`The secret number is ${secret}.`)
}
}
const f = foo() // `secret...
How to expand a list to function arguments in Python [duplicate]
... the documentation as "Unpacking argument lists".
You'd use it like this: foo(*values). There's also one for dictionaries:
d = {'a': 1, 'b': 2}
def foo(a, b):
pass
foo(**d)
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What does the 'u' symbol mean in front of string values? [duplicate]
...on Python 2.
You can create a Unicode string multiple ways:
>>> u'foo'
u'foo'
>>> unicode('foo') # Python 2 only
u'foo'
But the real reason is to represent something like this (translation here):
>>> val = u'Ознакомьтесь с документацией'
>>...
slim dynamic conditional class [closed]
...have multiple conditions I am doing right now something like
div class=(('foo ' if is_foo?) + ('bar' if is_bar?))
Though I feel it to be a blemish if is_bar? return false and the generated HTML results in
<div class="foo "></div>
(the blemish is the blank character after the foo). ...
What's the meaning of “=>” (an arrow formed from equals & greater than) in JavaScript?
...other words, you can often use them in place of expressions like function (foo) {...}. But they have some important differences. For example, they do not bind their own values of this (see below for discussion).
Arrow functions are part of the ECMAscript 6 specification. They are not yet supported i...
How do I parse XML in Python?
...like:
for type_tag in root.findall('bar/type'):
value = type_tag.get('foobar')
print(value)
And similar, usually pretty simple, code patterns.
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...
Accessing a class's constants
...
What you posted should work perfectly:
class Foo
CONSTANT_NAME = ["a", "b", "c"]
end
Foo::CONSTANT_NAME
# => ["a", "b", "c"]
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...
What is the difference between a symbolic link and a hard link?
...that might help, using any Linux(ish) console.
Create two files:
$ touch foo; touch bar
Enter some Data into them:
$ echo "Cat" > foo
$ echo "Dog" > bar
(Actually, I could have used echo in the first place, as it creates the files if they don't exist... but never mind that.)
And as exp...