lisak@sonofagun:/opt$ cat jada-backup.sh
#!/bin/bash

JHOME=/opt/jada
JBACKUP=/opt/jada-backup
ARCHIVE=jada_`date +%F-%H%M%S`.tar
USER=`whoami`
PASSWORD=`cat ~/jada/cred`
DBNAME=jada

if [ ! -f $JBACKUP ]
then
 mkdir $JBACKUP
fi

if [ $USER = "root" ]
then
  echo "You cannot run this script as root."
  exit 1
fi

if [ $PASSWORD ]
then
 echo "Create file ~/jada/cred with your password"
 exit 1
fi

mysqldump -u $USER -p$PASSWORD $DBNAME > $JHOME/sql/jada.sql
tar -c -f $JBACKUP/$ARCHIVE -C /opt jada
lisak@sonofagun:/opt$ sh -x jada-backup.sh
+ JHOME=/opt/jada
+ JBACKUP=/opt/jada-backup
++ date +%F-%H%M%S
+ ARCHIVE=jada_2011-07-19-020714.tar
++ whoami
+ USER=lisak
++ cat /home/lisak/jada/cred
+ PASSWORD=password
+ DBNAME=jada
+ '[' '!' -f /opt/jada-backup ']'
+ mkdir /opt/jada-backup
mkdir: cannot create directory `/opt/jada-backup': File exists
+ '[' lisak = root ']'
+ '[' password ']'
+ echo 'Create file ~/jada/cred with your password'
Create file ~/jada/cred with your password
+ exit 1