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End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

File.join

File.join(string, ...) → string

Returns a new string formed by joining the strings using "/".

Example
File.join("usr", "mail", "gumby")   #=> "usr/mail/gumby"
See also .identical? .lchmod .grpowned? .lchown also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0