Windows and Unix-related operating systems have different ways of specifying filenames.
Windows filenames look like c:\directory\filename.ext, whereas Unix-style filenames look like /directory/filename.ext.
You can use File class join method to create path that would work on both systems.
On Windows, you can use File.join to put together a filename using directory names and a final filename:
File.join('full', 'path', 'here', 'filename.txt') #full\path\here\filename.txt
On Unix-related operating systems, such as Linux, the code is the same:
File.join('full', 'path', 'here', 'filename.txt') #full/path/here/filename.txt
File.join method allows you to write the same code to run on both systems.
The separator itself is stored in a constant called File::SEPARATOR.
You can turn a filename into an absolute filename by appending the directory separator to the start, like so:
File.join(File::SEPARATOR , 'full', 'path', 'here', 'filename.txt') #/full/path/here/filename.txt
You can use File.expand_path to turn basic filenames into complete paths.