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How to ignore xargs commands if stdin input is empty?
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For GNU xargs, you can use the -r or --no-run-if-empty option:
--no-run-if-empty
-r If the standard input does not contain any nonblanks, do not run the command. Normally, the command is run once even if there is n...
How to search a specific value in all tables (PostgreSQL)?
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If you want to grep text data (which is typically encoded in more recent versions of postgres), you may need to ALTER DATABASE your_db_name SET bytea_output = 'escape'; on the database (or a copy thereof) before dumping it. (I'm not seeing a way t...
The best way to remove duplicate values from NSMutableArray in Objective-C?
...nswer below in 2009; in 2011, Apple added NSOrderedSet to iOS 5 and Mac OS X 10.7. What had been an algorithm is now two lines of code:
NSOrderedSet *orderedSet = [NSOrderedSet orderedSetWithArray:yourArray];
NSArray *arrayWithoutDuplicates = [orderedSet array];
If you are worried about the ord...
How do I calculate percentiles with python/numpy?
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By now, a percentile function exists in numpy: docs.scipy.org/doc/numpy/reference/generated/…
– Anaphory
Oct 29 '13 at 14:36
1
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C pointer to array/array of pointers disambiguation
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The general rule is operator precedence. It can get even much more complex as function pointers come into the picture.
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Best way to randomize an array with .NET
...oolness:
Random rnd=new Random();
string[] MyRandomArray = MyArray.OrderBy(x => rnd.Next()).ToArray();
Edit: and here's the corresponding VB.NET code:
Dim rnd As New System.Random
Dim MyRandomArray = MyArray.OrderBy(Function() rnd.Next()).ToArray()
Second edit, in response to remarks that S...
Is there any way I can define a variable in LaTeX?
In LaTeX, how can I define a string variable whose content is used instead of the variable in the compiled PDF?
5 Answers
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PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?
...ou check the host name against a white list:
$allowed_hosts = array('foo.example.com', 'bar.example.com');
if (!isset($_SERVER['HTTP_HOST']) || !in_array($_SERVER['HTTP_HOST'], $allowed_hosts)) {
header($_SERVER['SERVER_PROTOCOL'].' 400 Bad Request');
exit;
}
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How to specify function types for void (not Void) methods in Java8?
...element in a list I could simply create a consumer for that with a lambda expression:
List<String> allJedi = asList("Luke","Obiwan","Quigon");
allJedi.forEach( jedi -> System.out.println(jedi) );
You can see above that in this case, the lambda expression receives a parameter and has no r...
json.net has key method?
If my response has key "error" I need to process error and show warning box.
3 Answers
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