ip.read_line.output
ip.wait
-var op = new OProcess.init_("cat")
+var op = new OProcess.from_a("cat", null)
op.write("C hello world!\n")
op.close
op.wait
-var iop = new IOProcess.init_("cat")
+var iop = new IOProcess.from_a("cat", null)
iop.write("D hello world!\n")
iop.read_line.output
iop.close