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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...
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...
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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Getting error: Peer authentication failed for user “postgres”, when trying to get pgsql working with
...his file, don't forget to restart your PostgreSQL server. If you're on Linux, that would be sudo service postgresql restart.
These are brief descriptions of both options according to the official PostgreSQL docs on authentication methods.
Peer authentication
The peer authentication method work...
What does -1 mean in numpy reshape?
A numpy matrix can be reshaped into a vector using reshape function with parameter -1. But I don't know what -1 means here.
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