Dev Environment DB Purge and Rebuild

#!/bin/bash
#################################################################################################
# README
#
# Purges your dev DB and rebuilds it from source
#------------------------------------------------------------------------------------------------
# Usage
#
# ./dropTables.sh dbuser dbpass some_db /path/to/20100812123210.sql
#------------------------------------------------------------------------------------------------
# Original Source
#
# http://www.cyberciti.biz/faq/how-do-i-empty-mysql-database/
#################################################################################################

MUSER="$1"
MPASS="$2"
MDB="$3"
MSOURCE="$4"

# Detect paths
MYSQL=$(which mysql)
AWK=$(which awk)
GREP=$(which grep)

if [ $# -ne 4 ]
then
        echo "Usage: $0 {MySQL-User-Name} {MySQL-User-Password} {MySQL-Database-Name} {PATH-TO/MySQL-SOURCE.SQL}"
        echo "Drops all tables from a MySQL"
        echo "Then rebuilds the database from a source file"
        exit 1
fi

TABLES=$($MYSQL -u $MUSER -p$MPASS $MDB -e 'show tables' | $AWK '{ print $1}' | $GREP -v '^Tables' )

for t in $TABLES
do
        echo "Deleting $t table from $MDB database..."
        $MYSQL -u $MUSER -p$MPASS $MDB -e "drop table $t"
done

echo "Executing source $MSOURCE ..."
        $MYSQL -u $MUSER -p$MPASS $MDB -e "source $MSOURCE"