% ps -Upostfix 
  PID TT  STAT    TIME COMMAND
 1114  -  I    0:08.52 qmgr -l -t fifo -u
57382  -  I    0:00.04 pickup -l -t fifo -u
82762  -  I    0:01.28 tlsmgr -l -t unix -u

% ps -Upostfix --libxo=json
{"process-information": {"process": [{"pid":"1114","terminal-name"
+:"- ","state":"I","cpu-time":"0:08.52","command":"qmgr -l -t fifo -u"
+}, {"pid":"57382","terminal-name":"- ","state":"I","cpu-time":"0:00.0
+4","command":"pickup -l -t fifo -u"}, {"pid":"82762","terminal-name":
+"- ","state":"I","cpu-time":"0:01.28","command":"tlsmgr -l -t unix -u
+"}]}
}
[download]