process tree using ps

commandline session

$ 4.2.29 10 510---> ps -H
  PID TTY          TIME CMD
 4668 pts/1    00:00:00 bash
 4669 pts/1    00:00:53   evince
 4738 pts/1    00:00:00   ps
$ 4.2.29 11 511--->

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