'''id process'''
    :   Return the process ID of the current process (also see [pid]).
'''id process parent'''
    :   Return the process  ID  of  the  parent  of  the  current process.
'''id process group'''
    :   Return the process group ID of the current process.
'''id process group set'''
    :   Set  the  process  group ID of the current process to its process ID.

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