As noted by theo in this stackoverflow post file expand path is used to get the absolute path when the relative path is known i think file expand path is somewhat antiquated now that require relative exists but it is work studying a rails still uses it. In this api it will according to the documentation file exists. If you ve ever worked with io especially reading writing files you ll probably agree that it tends to be a good idea to ensure a file path directory or whatever else exists before trying to use it in your software.
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