ios.closed? รข true or false
Instance Public methods
Returns true if ios is completely closed (for duplex
streams, both reader and writer), false otherwise.
f = File.new("testfile")
f.close #=> nil
f.closed? #=> true
f = IO.popen("/bin/sh","r+")
f.close_write #=> nil
f.closed? #=> false
f.close_read #=> nil
f.closed? #=> true
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