Cron job failing to backing up a Postgres database

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http://serverfault.com – I'm unsure what's going on here: I've got a backup script which runs fine under root. It produces a >300kb database dump in the proper directory. When running it as a cron job with exactly the same command however, an empty gzip file appears with nothing in it. The cron log shows no error, just that the command has been run. This is the script: #! /bin/bash DIR="/opt/backup" YMD=$(date "+%Y-%m-%d") su -c "pg_dump -U postgres mydatabasename | gzip -6 > "$DIR/database_backup.$YMD.gz" " postgres # delete backup files older than 60 days OLD=$(find $DIR -type d -mtime +60) if [ -n "$OLD" (HowTos)