vtool: Usage Message

    A tool to execute a command using one or more features managed by the
    Altair Engineering-LM license manager. The VOV_JOBCOUNTER environment
    variable must point to the license manager vovserver instance using the
    format of port@host,instance (eg: 5557@lmhost,licmon).
    Multiple instances can be specified by separating them with a colon
    (eg: 5557@lmhost1,licmon1:6667@lmhost2,licmon2). If multiple instances
    are specified, each subsequent instance will be queried if the requested
    tokens were not granted by the previous instance in the list.
    By default, each instance must be able to grant the requested number of
    tokens in whole.  However, scavenging mode (-s) can be used to allow
    each instance to partially fulfill the request.

    % vtool [-v] [-refresh <S>] -f <feature1> <tokens1> \
         [-f <feature2> <tokens2> ...] <command ...>

    -v                -- Increase verbosity.
    -f <feature> <N>  -- Check-out N tokens of specified feature.
                         If N is negative, queueing will be enabled for the
                         absolute value of N tokens.
                         It is an error for N to be zero.
    -refresh     <S>  -- Specify refresh cycle (time-spec) for tokens
                         (default is 600 seconds), meaning that
                         the tokens are refreshed every 10 minutes.
                         Setting a refresh cycle of 0 disables
                         the refresh.
    -s                -- Scavenging mode. When VOV_JOBCOUNTER is set to a
                         colon delimited list of license servers, a check
                         out from each server will occur until the target
                         number of tokens has been reached. If queuing is
                         enabled, only the last server will enter queuing
                         mode regardless of its license capability.

     TSTP             -- Release licenses and suspend execution.
     CONT             -- Resume execution.
     HUP              -- Caught and ignored
     TERM             -- Caught and ignored
     QUIT             -- Caught and ignored

    vlmstat vovcounters

    % vtool -f lic_drc -1 -f lic_hdrc -1 sleep 10
    % vtool -s -f lic_drc 3 sleep 10
    % vtool -f lic_drc 3  -refresh 2m  sleep 10000