Find out when a file was created, modified, or last accessed with ctime, mtime, and atime, respectively
File::ctime( "file.rb" ) # => Wed Nov 08 10:06:37 -0700 2006
File::mtime( "file.rb" ) # => Wed Nov 08 10:44:44 -0700 2006
File::atime( "file.rb" ) # => Wed Nov 08 10:45:01 -0700 2006
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