getpriority
process.getpriority( aKind, anInteger ) -> aFixnum
Gets the scheduling priority for specified process, process group, or user. aKind indicates the kind of entity to find: one of Process::PRIO_PGRP , Process::PRIO_USER , or Process::PRIO_PROCESS . anInteger is an id indicating the particular process, process group, or user (an id of 0 means current). Lower priorities are more favorable for scheduling. Not available on all platforms.

Process.getpriority(Process::PRIO_USER, 0) » 0
Process.getpriority(Process::PRIO_PROCESS, 0) » 0

gid
process.gid -> aFixnum
Returns the group id for this process.
Process.gid » 500

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