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Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
I guess I'm not clear on how to do "and" tests. I wanted to make sure an argument existed which was working well with [ -e $VAR ] , but it turns out that was also evaluating as true on an empty string; which I do not want.
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What does asterisk * mean in Python? [duplicate]
...nary.
Also, see Function Calls.
Assuming that one knows what positional and keyword arguments are, here are some examples:
Example 1:
# Excess keyword argument (python 2) example:
def foo(a, b, c, **args):
print "a = %s" % (a,)
print "b = %s" % (b,)
print "c = %s" % (c,)
print a...
How to parse JSON in Java
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I agree with @StaxMan. I just tried org.json and it's horribly cumbersome. It really doesn't play with with standard Java Collection types, for example.
– Ken Williams
Nov 12 '14 at 16:55
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How can I repeat a character in Bash?
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You can use:
printf '=%.0s' {1..100}
How this works:
Bash expands {1..100} so the command becomes:
printf '=%.0s' 1 2 3 4 ... 100
I've set printf's format to =%.0s which means that it will always print a single = no matter what argument it is given. Therefore it prints 100 =s.
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What is Double Brace initialization in Java?
...es an anonymous class derived from the specified class (the outer braces), and provides an initialiser block within that class (the inner braces). e.g.
new ArrayList<Integer>() {{
add(1);
add(2);
}};
Note that an effect of using this double brace initialisation is that you're creating...
Password hint font in Android
...rent solutions, the second of which has better behavior for me:
1) Remove android:inputType="textPassword" from your xml file and instead, in set it in java:
EditText password = (EditText) findViewById(R.id.password_text);
password.setTransformationMethod(new PasswordTransformationMethod());
Wit...
How to make a DIV visible and invisible with JavaScript
...roperty of that element. To show/hide, you can use two properties: display and visibility, which have slightly different effects:
Adjusting style.display will look as if element is not present at all ("removed").
elem.style.display = 'none'; // hide
elem.style.display = 'block'; // show - use this...
How do I convert seconds to hours, minutes and seconds?
...his is the best way, IMHO, as you can then use arithmetic on the timedelta and any datetime objects.
– Matthew Schinckel
Apr 22 '09 at 3:13
13
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Can you attach Amazon EBS to multiple instances?
We currently use multiple webservers accessing one mysql server and fileserver. Looking at moving to the cloud, can I use this same setup and attach the EBS to multiple machine instances or what's another solution?
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Why do we need Abstract factory design pattern?
...tract Factory has been accepted as the solution.
To the best of my understanding, these questions represent real concerns or problems that people had, so that should get you started with some real-life examples:
Is there a pattern for initializing objects created via a DI container
Can't combine ...