【shell案例】学员管理系统「建议收藏」

#!/bin/bash
## 随机点名册
while true
do
echo "学生随机点名系统"
echo "1. 添加学员名单"
echo "2. 遍历学员名单"
echo "3. 随机点名"
echo "4. 删除某个学员的信息"
echo "5. 退出"
read -p "请输入你要选择的序号: " num
case $num in
1)
name(){ 

while true
do
read -p "填写要添加的名字: " num1
if [ -f namelist.txt ];then
name1=`grep $num1 namelist.txt`
else
echo "正在键入信息请稍后..."
sleep 2
touch namelist.txt
name1=`grep $num1 namelist.txt`
fi
if [[ $num1 == $name1 ]];then
echo "该学员已经存在!"
else
echo $num1 >> namelist.txt
read -p "是否继续添加Y|N: " num2
if [ $num2 == "Y" ] || [ $num2 == "y" ];then
name
#echo "学员添加成功!"
elif [ $num2 == "N" ] || [ $num == "n" ];then
echo "请重新确认学员姓名"
break
else
echo "你输入的字符有误，请输入Y|N"
break
fi
fi
done 
}
name
;;
2)
echo "你选择的是遍历学员名单，正在为您遍历请稍后..."
for i in `cat namelist.txt`
do
echo $i
sleep 1
done
echo "遍历完成" 
total=`cat namelist.txt |wc -l`
echo "已为您遍历 $total 个学员"
;;
3)
while(true)
do
line=`cat namelist.txt |wc -l`
num3=$[RANDOM%line+1]
sed -n "${num3}p" namelist.txt
sleep 0.3
read -p "是否要返回学员管理系统y/n: " input
if [ $input  == "Y" ] || [ $input  == "y" ];then
echo "正在返回请稍后"
echo ''
break
elif [ $input == "N" ] || [ $input == "n" ];then
echo "暂时没想到你不回学员管理系统还能干啥，要不搭建一套架构？"
else
echo "你输入的字符有误，请输入Y|N"
break
fi
done
clear
echo ""	
echo "===============学员管理系统============"
echo "==========欢迎来到学员管理系统========="
;;
4)
while(true)
do
cat namelist.txt
read -p "请输入要删除的学员: " num4
while read line
do
#echo $line
if [ $line == $num4 ];then
sed -i "/${num4}/d" namelist.txt
#name=`grep $num4 namelist.txt`
#if [[ $num4 == $name ]];then
# sed -i "/${num4}/d" namelist.txt
echo "删除成功!"
#else
# echo " "
fi
done < namelist.txt
read -p "是否返回学生系统管理首页Y|N: " back
if [ $back == "y" ] || [ $back == "Y" ];then
echo "正在返回请稍后"
break
else
echo ""
fi
done
clear
echo "" 
echo "===============学员管理系统============"
echo "==========欢迎来到学员管理系统========="
;;
5)
echo "感谢您使用学员管理系统，请给五星好评哦"
exit
;;
esac
done