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Expansion of variables inside single quotes in a command in Bash

...relevant: Which characters need to be escaped in bash? Do not concatenate strings interpreted by a shell You should absolutely avoid building shell commands by concatenating variables. This is a bad idea similar to concatenation of SQL fragments (SQL injection!). Usually it is possible to have pl...
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What is the difference between is_a and instanceof?

... versions >= 5.3.9 now accept an optional third boolean argument $allow_string (defaults to false) to allow comparisons of string class names instead: class MyBaseClass {} class MyExtendingClass extends MyBaseClass {} // Original behavior, evaluates to false. is_a(MyExtendingClass::class, MyBas...
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How to remove line breaks from a file in Java?

How can I replace all line breaks from a string in Java in such a way that will work on Windows and Linux (ie no OS specific problems of carriage return/line feed/new line etc.)? ...
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How to dynamic new Anonymous Class?

...ove fields on the fly. edit Sure you can: just cast it to IDictionary<string, object>. Then you can use the indexer. You use the same casting technique to iterate over the fields: dynamic employee = new ExpandoObject(); employee.Name = "John Smith"; employee.Age = 33; foreach (var propert...
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How do I return multiple values from a function in C?

If I have a function that produces a result int and a result string , how do I return them both from a function? 8 Answe...
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LINQ .Any VS .Exists - What's the difference?

...012"); if (forceListEval != "sdsdf") { var s = string.Empty; var start2 = DateTime.Now; if (!list1.Exists(o => o == "0123456789012")) { var end2 = DateTime.Now; s += " Exists: " + end2.Subtract(start2)...
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Sql Server string to date conversion

I want to convert a string like this: 14 Answers 14 ...
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Java RegEx meta character (.) and ordinary dot?

... have to escape it with a backslash. Since regexes in Java are normal Java strings, you need to escape the backslash itself, so you need two backslashes e.g. \\. share | improve this answer ...
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How can I create a UILabel with strikethrough text?

... SWIFT 4 UPDATE CODE let attributeString: NSMutableAttributedString = NSMutableAttributedString(string: "Your Text") attributeString.addAttribute(NSAttributedString.Key.strikethroughStyle, value: 2, range: NSMakeRange(0, attributeString.length)) then: ...
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Convert a space delimited string to list [duplicate]

i have a string like this : 5 Answers 5 ...