shell实现学生成绩管理系统

echo "hello world" > myfile

echo "hello world" >> myfile

#! /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}clearwhile truedo  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