Plug-in doesn't work on HP-UX (at least on version 11.3) because it uses 'ps' CLI with '-o' cmdline option which isn't supported on that system without explicit the UNIX behavior switch on.

There are several ways how to achieve the anticipated behavior, one way is for ex.:

It can be called like:

UNIX95= ps -u hudson -o pid,ppid,args

But

ps -u hudson -o pid,ppid,args

provides a such result:

ps -u hudson -o pid
ps: illegal option -- o
usage: ps [-edaxzflP] [-u ulist] [-g glist] [-p plist] [-t tlist] [-R prmgroup] [-Z psetidlist]