[GENERAL] howto? Fine Debugging control at cmd line

[OpenMacNews]

hi all,
per the docs, i understand i *can* define/change the global pgsql debugging 
level at the cmd line by passing, say, pg_ctl the '-o "-d 5"' option,

AND,
that i can finely change loglevel options in postgresql.conf, e.g.:
client_min_messages = debug5      # debug5, debug4, debug3, debug2, debug1,
                                  # log, notice, warning, error
log_min_messages =debug5          # debug5, debug4, debug3, debug2, debug1,
                                  # info, notice, warning, error, log, fatal, 
panic
log_error_verbosity = verbose     # terse, default, verbose
log_min_error_statement = debug5  # debug5, debug4, debug3, debug2, debug1,

can I, however, *individually* change these "fine" logging controls at the 
command line, and simply re-HUP?  e.g., for just a quick debug session?

seems like it might be reasonable to do so, but i think i'm missing the 
(possibly?) obvious ...

or, does one make the change in the .conf file, and then rehup?
any pointers?
thanx!
richard
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