linux 用户管理脚本

#!/bin/bash
function mod_g()
{	
	sudo usermod -G $2 $1
}
function mod_p()
{
	sudo passwd $1
}
function add_user()  
{  
	echo "请输入用户名";
	read user_name;
	sudo useradd $user_name
        sudo passwd $user_name	
	echo "设置用户所在组"
	read grp;
	mod_g $user_name $grp
}  
function del_user()
{
	echo "请输入要删除的用户名称"
	read user_name
	sudo userdel $user_name
}
function mod_user()
{
	echo "请输入要修改的用户名称"
	read user_name	
	echo "0. 修改密码"
	echo "1. 修改组名"
	read opt
	if [ $opt="0" ];then
		mod_p $user_name
	elif [ $opt="1" ];then	
		echo "设置组名称"
		read grp
		mod_g $user_name $grp	
	fi
}
function query_user()
{
	more  /etc/passwd
}
echo "please chose the options"
echo "0.add    user"
echo "1.del    user"
echo "2.mod    user"
echo "3.query  user"
read choice
if [ $choice = "0" ];then
{
	add_user 
}
elif [ $choice = "1" ];then
{
	del_user
}
elif [ $choice = "2" ];then
{
	echo "请输入要修改的用户名称"
	read user_name
	mod_user $user_name
}
elif [ $choice = "3" ];then
{
	query_user
}
fi