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Can't su to user jenkins after installing Jenkins
...false at the end of the line.
Hint: You don't use su and sudo at the same time.
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A Java API to generate Java source files [closed]
.... I don't think it's API is exactly like the one you described, but every time I've heard of a project doing Java source generation they've used JET or a homegrown tool.
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Test if characters are in a string
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@GregSnow -- Tried system.time(a <- grepl("abc", vec)) and system.time(a <- grepl("abc", vec, fixed=TRUE)), and fixed=TRUE is still, if anything slightly slower. The difference isn't appreciable with these short strings, but fixed=TRUE still doe...
Regex exactly n OR m times
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There is no single quantifier that means "exactly m or n times". The way you are doing it is fine.
An alternative is:
X{m}(X{k})?
where m < n and k is the value of n-m.
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Looking to understand the iOS UIViewController lifecycle
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All these commands are called automatically at the appropriate times by iOS when you load/present/hide the view controller. It's important to note that these methods are attached to UIViewController and not to UIViews themselves. You won't get any of these features just using a UIView.
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Remove blank lines with grep
...tc.
* previous match (whitespace) may exist from 0 to infinite times
$ match end of line
Running the code-
$ echo "
> hello
>
> ok" |
> grep -v "^[[:space:]]*$"
hello
ok
To understand more about how/why this works, I recommend reading up on regular exp...
Get image data url in JavaScript?
...ase64 version of an image file, they have to request it again (most of the time it will come from cache) but this time as a Blob.
Then you can use a FileReader to read it either as an ArrayBuffer, or as a dataURL.
function toDataURL(url, callback){
var xhr = new XMLHttpRequest();
x...
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
...R - these are requests made by javascript code.
Tip: log is cleared every time you load a page, at the bottom of the picture, the black dot button will preserve log.
After analyzing requests and responses you can simulate these requests from your web-crawler and extract valuable data. In many case...
In Objective-C why should I check if self = [super init] is not nil?
...ecause of this it's standard practice to check for nil pretty much all the time, for consistency's sake.
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Abstract functions in Swift Language
...Also the subclass still isn't forced to implement the functions at compile time, and you not compelled to implement the protocol either.
– bandejapaisa
Dec 30 '14 at 17:05
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