vpath - /#option/debug=level

set debug trace level

vpath - /#option/trace[=pid]

turn on truss style tracing with option pid prefix

vpath /dev/tcp/share/cat/#/home/gsf/tmp/call.out \

/#fs/proc/global/monitor/call=fork,exec,exit

monitor fork,exec,exit by sending messages to the cat server

vpath /tmp/io.out \

/#fs/io/global/monitor/call=open,close,write

monitor open,close,write by appending messages /tmp/io.out

vpath /home/gsf/tmp/rpl.out /#fs/rpl/monitor

create a per-tree monitor to rpl.out

vpath . /#rpl /tmp /#rpl

all calls on files in . and /tmp trees monitored to rpl.out