running pg_dumpall as a cron job

[richard <richard(at)sheugh(dot)com>]

Hi all 

I am trying to run pg_dumpall as a cron job. I find that while 
pg_dump has an option -f to name a file for output this is 
not available for pg_dumpall. After reading the manual, my  
guess is that best practice is to run pg_dump for each database. 

Is there a preferred way of routinely saving all your 
databases via pg_dump or pg_dumpall? 

TIA

Richard A Lough