shell脚本学习DAY1 student.sh

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最新推荐文章于 2024-08-31 00:59:31 发布

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这是一个使用Unix Shell语言编写的简易学生记录管理系统，包含搜索、添加、删除、显示所有记录及编辑功能。用户可以通过简单的命令行界面进行操作，适用于小型教育机构或个人学习。

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#! /bin/bash
#sed -i 's/ 原字符串 / 替换字符串 /g' filename // 替换文件中的所有匹配项
#sed -i 's/\r$//' student.sh
#查询函数
search()
{
clear
echo -e "Please enter name >>>\c"
read NAME
#如果记录为空
if [ ! -f ./record ];then
    echo "you must have some scores before you can search!"
    sleep 2
    clear
    return
fi
#没有输入名字进行查询
if [ -z "$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 enter 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!"
}

#退出程序
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