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Allowed characters in Linux environment variable names

What characters are allowed in Linux environment variable names? My cursory search of man pages and the web did only produce information about how to work with variables, but not which names are allowed. ...
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How do I get indices of N maximum values in a NumPy array?

...t been able to find one. If this solution turns out to be too slow (especially for small n), it may be worth looking at coding something up in Cython. share | improve this answer | ...
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Efficiently convert rows to columns in sql server

...d than just a single script but gives you much more flexibility. First of all There are 3 objects: User defined TABLE type [ColumnActionList] -> holds data as parameter SP [proc_PivotPrepare] -> prepares our data SP [proc_PivotExecute] -> execute the script CREATE TYPE [dbo].[ColumnAc...
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How can we programmatically detect which iOS version is device running on? [duplicate]

... answered Sep 24 '13 at 16:32 Gabriele PetronellaGabriele Petronella 99.8k2020 gold badges198198 silver badges222222 bronze badges ...
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MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update

...| edited Dec 18 '13 at 12:32 Joe 41.2k2222 gold badges131131 silver badges219219 bronze badges answered ...
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Check orientation on Android phone

...anging, because the launcher has locked the screen orientation and doesn't allow it to change. So it is correct that .orientation doesn't change, because the orientation hasn't changed. The screen is still portrait. – hackbod Feb 23 '12 at 8:32 ...
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Android Studio needs JDK 7 for Android-L mac

... user3144836user3144836 3,61933 gold badges2323 silver badges2525 bronze badges add a comment ...
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Why use Ruby's attr_accessor, attr_reader and attr_writer?

...write classes which will work correctly no matter how their public API is called. class Person attr_accessor :age ... end Here, I can see that I may both read and write the age. class Person attr_reader :age ... end Here, I can see that I may only read the age. Imagine that it is set ...
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Combining two expressions (Expression)

...m); } Starting from .NET 4.0, there is the ExpressionVisitor class which allows you to build expressions that are EF safe. public static Expression<Func<T, bool>> AndAlso<T>( this Expression<Func<T, bool>> expr1, Expression<Func<T, bool>&...
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Creating instance of type without default constructor in C# using reflection

... I originally posted this answer here, but here is a reprint since this isn't the exact same question but has the same answer: FormatterServices.GetUninitializedObject() will create an instance without calling a constructor. I found...