pvm> help
help
help        Print helpful information about a command
Syntax:  help [ command ]
Commands are:
  add         Add hosts to virtual machine
  alias       Define/list command aliases
  conf        List virtual machine configuration
  delete      Delete hosts from virtual machine
  echo        Echo arguments
  export      Add environment variables to spawn export list
  getopt      Display PVM options for the console task
  halt        Stop pvmds
  help        Print helpful information about a command
  id          Print console task id
  jobs        Display list of running jobs
  kill        Terminate tasks
  mstat       Show status of hosts
  names       List message mailbox names
  ps          List tasks
  pstat       Show status of tasks
  put         Add entry to message mailbox
  quit        Exit console
  reset       Kill all tasks, delete leftover mboxes
  setenv      Display or set environment variables
  setopt      Set PVM options - for the console task *only*!
  sig         Send signal to task
  spawn       Spawn task
  trace       Set/display trace event mask
  unalias     Undefine command alias
  unexport    Remove environment variables from spawn export list
  version     Show libpvm version
pvm> help spawn
help spawn
spawn       Spawn task
Syntax:  spawn [ options ] file [ arg ... ]
Options:  -(count)  number of tasks, default is 1
          -(host)   spawn on host, default is any
          -(ARCH)   spawn on hosts of ARCH
          -?        enable debugging
          ->        redirect output of job to console
          ->(file)  redirect output of job to file
          ->>(file) append output of job to file
          -@        trace job, display output on console
          -@(file)  trace job, output to file
pvm> help trace
help trace
trace       Set/display trace event mask
Syntax:  trace
         trace [+] name ...
         trace - name ...
         trace [+] *
         trace - *
         trace xpvm (default mask for XPVM display)
         trace buf nbytes
         trace buf
         trace opt < full | time | count >
         trace opt
pvm>