#!/bin/bashMODULE_NUM=1MODULE_MAX_NUM=5WORK_PATH=/root/shell/workspace#add moduleadd(){    installNum=$MODULE_NUM    if [ -z $2 ]; then        echo "install default number : $MODULE_NUM"    else        installNum=$2    fi    if [ $installNum -gt $MODULE_MAX_NUM ]; then        installNum=$MODULE_MAX_NUM    fi    echo "install number is $installNum"    for i in $(seq 1 $installNum); do        do_add $i    done}#do the add operationdo_add(){    if [ ! -e $WORK_PATH/test$1 ]; then        mkdir $WORK_PATH/test$1        echo "add test$1"    fi}#do the remove operationdo_remove(){    if [ -d $WORK_PATH/test$1 ]; then        echo "remove module $1"        rm -rf $WORK_PATH/test$1    fi}#remove all modulesremove(){    #echo "remove all modules"    for((i=1;i<=$MODULE_MAX_NUM;i++)); do        if [ -e $WORK_PATH/test$i ]; then            do_remove $i        fi    done}#modify modules numbermodify(){    modNum=$2    echo modify modules number to $2    for((i=$MODULE_MAX_NUM;i>$2;i--)); do        #echo "remove module $i"        do_remove $i    done    if [ $modNum -gt $MODULE_MAX_NUM ]; then        modNum=$MODULE_MAX_NUM    fi    for((i=1;i<=$modNum;i++)); do        #echo "add module $modNum"        do_add $i    done}#main processcase $1 inadd)    add $1 $2;;rmv)    remove $1;;mod)    modify $1 $2;;*)    echo -e "bad parameter, usage :    balabala...";;esac