使用Bash脚本从文本文件创建/删除用户

我知道这个问题已经问了很多，但我似乎无法解决这个问题，我有点忙，好吧.

I know this question has been asked a lot but I just can't seem to get it working and I'm kinda on the clock, okay so.

我正在尝试使用4个选项菜单制作一个bash脚本:1添加单个用户2从列表添加3删除单个用户4从列表中删除

I'm trying to make a bash script with a 4 option menu: 1 Add single user 2 Add from list 3 Delete single user 4 Delete from list

添加和删除单个用户我一直在努力，只是从列表中打败了我.

Adding and deleting single users I've got working it's just from list that keep defeating me.

这是我到目前为止获得的代码

This is the code I've got so far

#!/bin/bash

choice=5
# Main display
echo "Enter number to select an option"
echo
echo "1) Add Single User"
echo "2) Add Users from list"
echo "3) Delete Single User"
echo "4) Delete users from list"
echo

while [ $choice -eq 5 ]; do

read choice

if [ $choice -eq 1 ] ; then    

    echo -e "Enter Username"
    read user_name
    echo -e "Enter Password"
    read user_passwd
    sudo useradd $user_name -m -p $user_passwd
    cat  /etc/passwd 

else                   

    if [ $choice -eq 2 ] ; then
        x=0
        created=0

        echo -e "Enter file name for users:"
        read user_list

        sudo useradd "$user_list" -m -p "$user_list"

        else

            if [ $choice -eq 3 ] ; then
            cat  /etc/passwd 
            echo
            echo -e "User to be deleted:"
            read del_user
            sudo userdel -r $del_user
            cat  /etc/passwd
            echo

                else

        if [ $choice -eq 4 ] ; then
        echo "Not yet finished"


        else
            echo "#####################"
            echo "# Stop being a noob #"
            echo "#####################"
            echo "1) Add Single User"
            echo "2) Add Users from list"
            echo "3) Delete Single User"
            echo "4) Delete users from list"
            echo
                        choice=5
                fi   
        fi
fi
fi
done

用于吸引用户的文件仅仅是

The file to get the users from is just

User20
User19
User18
User17
User16
User15
User14
User13
User12
User11
User10
User9
User8
User7
User6
User5
User4
User3
User2
User1

我知道这很草率，但是我只需要演示文稿演示的演示，就可以得到任何帮助.

It's sloppy as hell I know but I just need it for a demo from a presentation assignment, any help is appreciated.

谢谢.