Get Op

#!/bin/bash
function usage
{
 if [ $# -gt 0 ]; then
        echo $@ >&2
 fi
 cat << EOF >&2
usage : t [-v][-h host_name][-P port_num][-u user_name][-p password][-D db_name]
Other parameters (-h, -P, ... -D) = Same as mysql command (refer to mysql documentation).
EOF
 exit 1
}
function cat_args
{
 echo $msql $1 $2
}
msql='/usr/local/mysql5/bin/mysql '

called_with="$@"
while getopts "vh:P:u:p:D:" arg
do
        case $arg in
                h|P|u|p|D)
                        msql=$(cat_args -$arg$OPTARG)
                        ;;
                v)
                        verbose=1
                        ;;
                *|?)
                        usage incorrect parameter
                        ;;
        esac
done

echo $msql
echo show tables|$msql