shell如何实现学生成绩管理系统

#! /bin/bash

#查询函数

search()

{

    clear

    echo -e "Please enter name >>>\c"

    read NAME

    #如果记录为空

    if [ ! -f ./record ];then

        echo "you must have some scores before you can search!"

        sleep 2

        clear

        return

    fi

    #没有输入名字进行查询

    if [ -z "$NAME" ];then

        echo "you didn't enter a name!"

        echo -e "Please enter name >>>\c"

        read NAME

    fi

    grep -i "$NAME" ./record 2> /dev/null

    case "$?" in

      1) echo "Name not in record."

        ;;

      2) echo "you didnt eter a name to search";

        sleep 2;

        search;;

    esac

}

#增加信息

add()

{

    clear

    echo "Enter name and score of a record"

    echo -e "\c"

    if [ ! -f ./record ];then

        touch record

    fi

    read NEWNAME

    #关于输出重定向，>代表覆盖式的写入 ，>>代表添加式的写入

    echo "$NEWNAME" >>./record

    sort -o ./record ./record

}

#删除学生信息

delete()

{

    clear

    echo -e "Please enter delete name"

    read NAME

    if [ ! -f ./record ];then

      echo "this name is not in record"

    else

      cp record record.bak

      rm -f record

      grep -v "$NAME" ./record.bak > record

      rm -f record.bak

      fi

}

#显示所有的记录函数

display()

{

    more ./record

}

#利用vim编辑器编辑函数

edit()

{

  vim ./record

}

#屏幕帮助操作

help()

{

  clear

  echo "this is a student record program by unix shell language!"

}

#推出程序

quit()

{

  clear

  exit

}

clear

while true

do

    echo "*********************************************"

    echo "****     student record menu    ****"

    echo "*********************************************"

    echo "---------------------------------------------"

    echo "#############################################"

    echo "       1-search a record       "

    echo "       2-add a record         "

    echo "       3-delete a record       "

    echo "       4-dispaly all records     "

    echo "       5-edit record with vim     "

    echo "       H-help             "

    echo "       Q-exit             "

    echo "#############################################"

    echo -e -n "Please enter your choice [1,2,3,4,5,6,H,Q]:\c"

    read CHOICE

    case $CHOICE in

    1) search;;

    2) add; clear;;

    3) delete; clear;;

    4) display;;

    5) edit; clear;;

    H|h) help;;

    Q|q) quit;;

    *) echo "Invailid choice!";

    sleep 2;

    clear;;

    esac

  done