For that matter:
echo "1 3 * * * postgres /usr/local/bin/pg_dumpall > ~/backup.sql" >> /etc/crontab
note to remember the two >>'s so you don't obliterate your crontab like I just did.
Unless things have changed, and they might have, you have to tell cron to reread the crontab file for it to process your addition. Your better solution is to use the tools designed for editing crontab, such as 'crontab -e.' If you use this tool, crontab will automagically reread the file.
-- Until later, Geoffrey Registered Linux User #108567 AT&T Certified UNIX System Programmer - 1995
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