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As there are more than one way of getting things done in Ruby, File extension also can be obtained in more than one way. Use of File#extname is more suitable in Ruby get file extension from string.
An RB file is a software program written in Ruby, an object-oriented scripting language. Ruby is designed to be simple, efficient, and easy to read. RB files can be edited with a text editor and run using Ruby.
You can use the following functions for your purpose:
path = "/path/to/xyz.mp4"
File.basename(path) # => "xyz.mp4"
File.extname(path) # => ".mp4"
File.basename(path, ".mp4") # => "xyz"
File.basename(path, ".*") # => "xyz"
File.dirname(path) # => "/path/to"
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