db backup script in gentoo

How to create automated backup script in Gentoo which in every night 3:00 PM
backups one database and sends backup
with ftp using unique file name?

In windows I can use scheduler and script

set FILENAME=%DATE:~8,4%%DATE:~5,2%%DATE:~2,2%MyDbBackup
pg_dump -Z6 -b -v -f "%FILENAME%.backup" -F c -h localhost -U postgres mydb
ftp -send -u username -p password  "%FILENAME%.backup"  ftp.backupserver.com

I have few experience in Linux. How to convert this to Gentoo Linux ?

Andtus