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make users change pswd on 1st login

Hi, I have set up a sftp/ssh server at home, and I would like to give access to my friends. I am the only admin, and only I can add users. However, I would like to give them the freedom to pick their passwords. Most of my friends don't know jack about UNIX, so I would like to make them change their passwords with a nice looking script, on the first login. how can I do that. I am thinking about writing a shell script, but how can I make it execute only on the first login. I am open to other solutions as well.
Thanx for any help

As far as shell access (SSH) goes, once you create the account, run:

Code:

passwd -e username

Where username is the new user you created. The existing password is now expired. When they log in using SSH, they'll enter the password you gave them and go through the following:

Code:

login as: oracle

oracle@xx.xxx.xx.xx's password:

Last login: Fri Jan 20 14:35:47 2006 from xx.xxx.xx.xx

Linux 2.6.13.

WARNING: Your password has expired.

You must change your password now and login again!

Changing password for oracle

Old password:

Enter the new password (minimum of 5, maximum of 127 characters)

Please use a combination of upper and lower case letters and numbers.

New password:

Re-enter new password:

It's not pretty (and entering the old password twice is a pain), but it saves you some mucking around.

Thanks a lot,

That's exactly what I needed!
Ivan