Bash script to backup databases, sends an email with info about the results, admits one parameter if you want to backup only one specific database

backupdb.sh

#!/bin/bash

DATABASES=(db1 db2 dbN)

DATE=$(date +"%Y-%m-%d")
USER=''
PASSWORD=''
DIR='/the/backup/route'

if [ ! -d "$DIR" ]; then
  mkdir $DIR
fi

if [ -n "$1" ]; then
  DATABASES=($1)
fi

echo BACKUP OF DB AT $DATE >> $DIR/results.txt

for i in "${DATABASES[@]}"; do

  DB=${i}
  FILENAME=backup-$DB-$DATE.sql
  FILE=$DIR/$FILENAME

  mysqldump --user=$USER --password="$PASSWORD" $DB > "$FILE"
  tar -cvzf $FILE.tgz $FILE
  rm $FILE

  RESULT='';
  if [ -f "$FILE.tgz" ]; then
    RESULT="$DB Backup Complete and compression done"
  fi

  echo $RESULT >> $DIR/results.txt

done

# erase backups older than one week
find $DIR/* -mtime +7 -exec rm {} \;

# send an email with the results.txt
# mail -s "DB BACKUPS $DATE" email@localhost.com <<< $DIR/results.txt
# echo "Subject: DB BACKUPS $DATE" | cat - $DIR/results.txt | sendmail -F origin@localhost.com -t destination@localhost.com