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Pass a string to File.expand_path to generate the path to that file or directory. Relative paths will reference your current working directory, and paths prepended with ~ will use the owner's home directory.

File.expand_path('example.rb')
=> "/Users/avogel/My/Working/Directory/example.rb"

File.expand_path('~/example.rb')
=> "/Users/avogel/example.rb"

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Generate Absolute File Path In Ruby