bash argument case

bash_argument_case.sh

#!/bin/sh
if [ $# -lt 1 ]
then
    echo $0 opt
    echo 'list (list all topic)'
    echo 'describe topic (describe topic info)'
    echo 'len topic (show topic len)'
fi
case $1 in
list)
    ./kafka-topics.sh --zookeeper 127.0.0.1:2181 --list
    ;;
describe)
    ./kafka-topics.sh --zookeeper 127.0.0.1:2181 --describe --topic $2
    ;;
len)
    ./kafka-run-class.sh kafka.tools.GetOffsetShell  --broker-list 10.168.37.52:9092 --partitions 0 --topic $2
    ;;
esac