How does one monitor and trace Unix processes?
To trace what a Unix process is doing enter:
truss -rall -wall -p
truss -p $ lsnrctl dbsnmp_start
NOTE: The “truss” command works on SUN and Sequent. Use “tusc” on HP-UX, “strace” on Linux, “trace” on SCO Unix or call your system administrator to find the equivalent command on your system.