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

class method

Gem::Util.popen

popen(*command)

# File tmp/rubies/ruby-3.1.3/lib/rubygems/util.rb, line 55
def self.popen(*command)
  IO.popen command, &:read
end

This calls IO.popen and reads the result

See also .inflate .silent_system .gzip .traverse_parents also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0