A simple shell script with menu options

This is a simple shell script, which contains a lot of shell script writing skills, although the script is compiled from other video tutorials, however, it has paved the way for me to write shell scripts in the future.

#!/bin/bash############## main menu ##############main_menu (){echoechodis_mainmenu="CREATE MINISITE IN CHINAITLAB.COM"curdate=`date "+%Y-%m-%d %T"`cat <<mayday             DATE :$curdate    ============================================               $dis_mainmenu    ============================================       **    1)ADD MINISITE ACCOUNT           **    **    2)ADD DOMAIN IN CHINAITLAB.COM   **    **    3)ADD DATABASE IN MYSQL          **    **    4)ADD VIRTUAL  HOST IN APACHE    **    **    5)BACK MINISITE                  **    **    6)DELETE MINISITE                **    **    7)EXIT                           **mayday}while [ $loopvar -gt 0 ]do          main_mean    echo -n "             please choose[1-7]:"    read main_choice    case $main_choice in           7)     exit     ;;     *)     clear     esacdone

A simple shell script with menu options