看效果图：

设计要求

在主shell脚本文件中（必须以menu命名）要有一个多操作选项的菜单以便用户从中选择。此菜单的主要内容有：
①显示当前所有用户的记录
②显示用户名和用户ID
③查询并显示特定用户的记录
④往passwd文件中增加新用户的记录
⑤从passwd文件中删除某个用户的记录
⑥···退出···
在目录中主要有四个文件，分别为：menu、passwd、add、delete。其中menu文件中的程序完成菜单1~3功能；add和delete脚本文件分别完成4、5。当用户做了选择且完成所选的操作后，可以再次显示主菜单以供用户做下一步选择。
要求：①用while循环和case条件语句完成本次课程设计

目录

add代码

echo "you are in the add"
read -t 15 -p "please input your ID:" ID
echo "your ID = $ID"
echo -e "\n"
read -t 15 -p "please input your name:" name
echo "your name = $name"
echo -e "\n"
read -t 30 -p "please input your statu:" statu
echo "your name = $name"
echo -e "\n"
userinfo="$ID-$name-$statu"
echo "$userinfo" >> passwd.txt

delete代码

echo "you are in the delete"
echo "从passwd文件中删除某个用户的记录"
read -t 30 -p "please input you want to delect ID:" ID
a=1
for line in `cat passwd.txt`
do
 OLD_IFS="$IFS" #保存旧的分隔符
 IFS="-"
 arr=($line)
 IFS="$OLD_IFS" # 将IFS恢复成原来的
 if [ ${arr[0]} -eq $ID ]
 then
   sed -i "${a}d" passwd.txt
 fi
 let a+=1
done
echo "success delete!!"
echo "end show"
~                     

passwd.txt代码

02-b-student
03-c-teacher
04-d-people
05-g-student
~                   

menu代码

function add()
{

    sh add
    sleep 1
}

function delete()
{

    sh delete
    sleep 1
}

function showall()
{
echo "All userinfo"
for line in `cat passwd.txt`
do
 echo "[===$line===]"
done
echo "end show"
    sleep 1
}

function showuser()
{
echo "All ID and name"
for line in `cat passwd.txt`
do
 OLD_IFS="$IFS" #保存旧的分隔符
 IFS="-"
 arr=($line)
 IFS="$OLD_IFS" # 将IFS恢复成原来的
 echo "[**ID=${arr[0]}**name=${arr[1]}**]"
done
echo "end show"
    sleep 1
}

function finduser()
{
echo "查询并显示特定用户的记录"
read -t 30 -p "please input you want to find ID:" ID
for line in `cat passwd.txt`
do
 OLD_IFS="$IFS" #保存旧的分隔符
 IFS="-"
 arr=($line)
 IFS="$OLD_IFS" # 将IFS恢复成原来的
 if [ ${arr[0]} -eq $ID ]
 then
  echo "[**ID=${arr[0]}**name=${arr[1]}**statu=${arr[2]}**]"
 fi
done
echo "end show"
    sleep 1
}

function menu()
{
    cat << EOF
 *************************************
*                MENU                  *
*                                      *
*   1.add                 2.delete     *
*   3.exit                4.showall    *
*   5.showuser            6.finduser   *
*                                      *
*     author:509刘文豪  Don't copy!    *
 ************************************
EOF
}

function usage()
{
    read -p "please input your choice: " choice
    case $choice in
        1)
            add
            ;;
        2)
            delete
            ;;
        3)
            exit 0
            ;;
        4)
            showall
            ;;
        5)
            showuser
            ;;
        6)
            finduser
            ;;
    esac
}

function  main()
{
    while true
    do
        menu
        usage
    done
}

main

自此功能所有都实现