Useful [TclX] command for getting and manipulating [UNIX] identifiers of various kinds, especially including process, user and group ids.

**Subcommands**
    :   '''[id user]''' ?''name''?
    :   '''[id userid]''' ?''uid''?
    :   '''[id group]''' ?''name''?
    :   '''[id groupid]''' ?''gid''?
    :   '''[id groups]'''
    :   '''[id groupids]'''
    :   '''[id convert]''' ''type entity''
    :   '''[id effective]''' ''type''
    :   '''[id host]'''
    :   '''[id process]''' ?''options...''?



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