title: Are there some program like COM0COM in linux?
body: <p>I use com0com for program testing in windows,
  are there any program like com0com in linux?</p>
  
  <p>I know there is pts/ptmx, but what I want is a stand alone program to provide 2 virtual serial ports...</p>
  
  <p>Then I can open 2 program, each attench one...</p>