shell導出mysql數據成csv格式

#!/bin/bash
function usage {
       echo "Usage: $0 [OPTIONS] 
             -h  host --optional
             -P  port --optional
             -u  user
             -p  password
             -d  dbname
             -t  tablename
             -o  outputfile"
}
if [ $# -lt 1 ]
then
     usage
else
     while  getopts "h:p:u:P:d:t:o:" opt;
     do
        case ${opt} in
        h) host=${OPTARG}
        ;;
        o) outfile=${OPTARG}
        ;;
        P) port=${OPTARG}
        ;;
        u) user=${OPTARG}
        ;;
        p) passwd=${OPTARG}
        ;;
        d) dbname=${OPTARG}
        ;;
        t) tablename=${OPTARG}
        ;;
        esac
        done
fi
host=${host:-localhost}
port=${port:-3306}
MYSQL="mysql -h ${host} -P ${port}  -u ${user} -p${passwd} -ANe"
QUERY="SELECT COLUMN_NAME, COLUMN_TYPE, IS_NULLABLE, COLUMN_COMMENT FROM information_schema.columns WHERE table_schema = '${dbname}' AND table_name = '${tablename}'"

value=$(${MYSQL} "${QUERY}")
echo "${value}"|awk  '{out=""; for (i=4; i<=NF;i++){out=out" "$i};print $1"\t"$2"\t"$3"\t"out}' >>"$outfile".csv
#echo "${value}"|awk  '{out=""; for (i=4; i<=NF;i++){out=out" "$i};print $1","$2","$3","out}' >> test1.csv