[ale] password file users shell set /bin/null?

[Ben Ostrowsky]

>plunkett:x:511:511::/home/web/plunkett:/bin/null
>It works whening ftping, but no telnet or ssh.
>I am bewildered, Please explain?

I believe that if a user's shell doesn't exist, then login(1) (invoked by 
telnetd) won't allow you to log in.  However, ftpd doesn't invoke login(1), 
so it just takes the information and uses it to authenticate you.

Ben

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