Shell script to backup all mysql databases to seperate files

backup_mysql_databases.sh

#!/bin/bash
# Script will output dumps for all databases using seperate files
# Derived from this post: http://www.cyberciti.biz/faq/ubuntu-linux-mysql-nas-ftp-backup-script/

USER=""
PASSWORD=""
HOST="localhost"
MYSQL="$(which mysql)"
MYSQLDUMP="$(which mysqldump)"
OUTPUT_DIR=""

# Parse options
while getopts ":u:p:h:o:" opt; do
    case $opt in
        u)
            USER=$OPTARG
            ;;
        p)
            PASSWORD=$OPTARG
            ;;
        h)
            HOST=$OPTARG
            ;;
        o)
            OUTPUT_DIR=$OPTARG
            ;;
        \?)
            echo "Invalid option: -$OPTARG" >&2
            exit 1
            ;;
        :)
            echo "Option -$OPTARG requires an argument." >&2
            exit 1
            ;;
    esac
done

VALIDATION_ERROR=false

if [ -z "$USER" ]; then
    echo "User has not been specified" >&2
    VALIDATION_ERROR=true
fi

if [ -z "$PASSWORD" ]; then
    echo "Password has not been specified" >&2
    VALIDATION_ERROR=true
fi

if [ -z "$OUTPUT_DIR" ]; then
    echo "Output dir has not been specified" >&2
    VALIDATION_ERROR=true
fi

if $VALIDATION_ERROR ; then
    exit 1
fi

DBS="$($MYSQL -u $USER -h $HOST -p$PASSWORD -Bse 'show databases')"
for db in $DBS
do
    if [ $db != "information_schema" ]; then
        FILE=$OUTPUT_DIR/$db.sql
        $MYSQLDUMP -u $USER -h $HOST -p$PASSWORD --ignore-table=mysql.event $db > $FILE
    fi
done