wnat ot edit pg_hba.conf file from command prompt

hi,
i want ot modify the pg_hba.conf file from command prompt i tried this
command
C:\Program Files\Postgresql\8.4\bin>pgadmin3/ch:"C:/program
files/postgresql/8.4/data/pg_hba.conf
      but with this a window gets open and there is option to change methos
md5 to trust, is ther any parameters to pass with this command to edit
“pg_hba.conf”  file silently without user interaction




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