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What is the reason for the error message “System cannot find the path specified”?

There is not only 1 %SystemRoot%\System32 on Windows x64. There are 2 such directories. The real %SystemRoot%\System32 directory is for 64-bit applications. This directory contains a 64-bit cmd.exe. But there is also %SystemRoot%\SysWOW64 for 32-bit applications. This directory is used if a 32-bit application accesses %SystemRoot%\System32. It contains a 32-bit cmd.exe. 32-bit applications can access %SystemRoot%\System32 for 64-bit … Read more

How to set the environmental variable LD_LIBRARY_PATH in linux

I have first executed the command: export LD_LIBRARY_PATH=/usr/local/lib Then I have opened .bash_profile file: vi ~/.bash_profile. In this file, I put: Then if the terminal is closed and restarted, typing echo $LD_LIBRARY_PATH displays no result. How to set the path permanently?

Node.js version on the command line? (not the REPL)

The command line for that is: Or Note: If node -v doesn’t work, but nodejs -v does, then something’s not set up quite right on your system. See this other question for ways to fix it.

How to use “raise” keyword in Python [duplicate]

It has 2 purposes. yentup has given the first one. It’s used for raising your own errors. The second is to reraise the current exception in an exception handler, so that it can be handled further up the call stack.

How to revert a merge commit that’s already pushed to remote branch?

The -m option specifies the parent number. This is because a merge commit has more than one parent, and Git does not know automatically which parent was the mainline, and which parent was the branch you want to un-merge. When you view a merge commit in the output of git log, you will see its … Read more

Is there any doubly linked list implementation in Java?

Yes, LinkedList is a doubly linked list, as the Javadoc mentions : Doubly-linked list implementation of the List and Deque interfaces. Implements all optional list operations, and permits all elements (including null). All of the operations perform as could be expected for a doubly-linked list. Operations that index into the list will traverse the list … Read more

window.location.href and window.open () methods in JavaScript

window.location.href is not a method, it’s a property that will tell you the current URL location of the browser. Changing the value of the property will redirect the page. window.open() is a method that you can pass a URL to that you want to open in a new window. For example: window.location.href example: window.open() example: … Read more

What is the { get; set; } syntax in C#?

It’s a so-called auto property, and is essentially a shorthand for the following (similar code will be generated by the compiler):

Arrow operator (->) usage in C

foo->bar is equivalent to (*foo).bar, i.e. it gets the member called bar from the struct that foo points to.

Static Classes In Java

Java has static nested classes but it sounds like you’re looking for a top-level static class. Java has no way of making a top-level class static but you can simulate a static class like this: Declare your class final – Prevents extension of the class since extending a static class makes no sense Make the … Read more

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