OpenBSD ps(1) gains support for tree-like display of processes

[J65nko]

From https://undeadly.org/cgi?action=arti...20220902085038

Following a discussion on tech@, Job Snijders (job@), committed to ps(1) support for displaying the parent/child hierarchy of processes as an ASCII art tree

An example of the output:

$ ps ad -O ppid,user
      PID  PPID USER     TT  STAT        TIME COMMAND
    18180 12529 job      pb  I+p      0:00.01 `-- -sh (sh)
    26689 56460 job      p3  Ip       0:00.01   `-- -ksh (ksh)
     5153 26689 job      p3  I+p      0:40.18     `-- mutt
    62046 25272 job      p4  Sp       0:00.25   `-- -ksh (ksh)
    61156 62046 job      p4  R+/0     0:00.00     `-- ps -ad -O ppid
    26816  2565 job      p5  Ip       0:00.01   `-- -ksh (ksh)
    79431 26816 root     p5  Ip       0:00.16     `-- /bin/ksh
    43915 79431 _rpki-cl p5  S+pU     0:06.97       `-- rpki-client
    70511 43915 _rpki-cl p5  I+pU     0:01.26         |-- rpki-client: parser (rpki-client)
    96992 43915 _rpki-cl p5  I+pU     0:00.00         |-- rpki-client: rsync (rpki-client)
    49160 43915 _rpki-cl p5  S+p      0:01.52         |-- rpki-client: http (rpki-client)
    99329 43915 _rpki-cl p5  S+p      0:03.20         `-- rpki-client: rrdp (rpki-client)