Change Directory Temporarily for a Limited Scope

File::pushd does a temporary 'chdir' that is easily and automatically reverted, similar to 'pushd' in some Unix command shells. It works by creating an object that caches the original working directory. When the object is destroyed, the destructor calls 'chdir' to revert to the original working directory. By storing the object in a lexical variable with a limited scope, this happens automatically at the end of the scope. This is very handy when working with temporary directories for tasks like testing; a function is provided to streamline getting a temporary directory from File::Temp. For convenience, the object stringifies as the canonical form of the absolute pathname of the directory entered. *Warning*: if you create multiple 'pushd' objects in the same lexical scope, their destruction order is not guaranteed and you might not wind up in the directory you expect.

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